Method for determining optimal down filling density of down

Abstract

The invention relates to a method for determining the optimal down filling density of down, and the method comprises the following steps: S1, manufacturing a plurality of cylindrical down storage bins which have lower surfaces with the same area and different heights; s2, filling a down storage bin with a down sample with the mass of M; s3, gently disturbing the down storage bin; s4, calculating and recording the down filling density; s5, measuring the thermal resistance value of the down storage bin; s6, repeating the steps S2-S5, and measuring the thermal resistance value of each down storage bin; and S7, drawing a relation curve that the thermal resistance value changes along with the down filling density, and extracting the optimal down filling density rho gold when the thermal resistance value reaches a peak value. The down storage bins with different volumes are arranged, down samples with the same mass are used for filling, samples with different down filling densities under the same mass are obtained, and the optimal thermal insulation performance critical point of down can be accurately determined.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of testing the thermal performance of down products, and particularly relates to a method for determining the optimal down filling density of down. BACKGROUND

[0002] The conventional method for testing the thermal performance of down filling is to find the critical point of optimal thermal performance by changing the down filling amount while fixing the area of the sample, but this method does not take into account the volume change caused by the change in the height of the down package, and therefore cannot accurately determine the critical point of optimal thermal performance of down. The specific reasons are as follows:

[0003] The conventional method for testing the thermal performance of down requires the preparation of multiple independent down packages with different down filling amounts, and the measurement of the thermal resistance value Rct. However, this method has two major defects:

[0004] Variable coupling: when the down filling amount M is changed, the volume V of the down package changes synchronously, which makes it impossible to independently control the down filling density ρ=M / V, and it is impossible to distinguish whether the change in thermal resistance is caused by the down filling amount or the volume.

[0005] Masking the real law: the thermal performance of down actually depends on the thickness of the static air layer, which changes nonlinearly with the density: in the low-density zone, air convection dominates, and the thermal resistance is low; in the medium-density zone, the static air layer is maximized, and the thermal resistance reaches a peak; in the high-density zone, the compression of down leads to an increase in conduction, and the thermal resistance decreases.

[0006] The conventional method cannot reveal this law due to the uncontrollable density, and it is also impossible to locate the optimal density point.

[0007] The down filling amount of a down jacket is currently determined by the down filling coefficient and the area of the required sample, but as the down filling amount changes, the height of the down package also changes, as does the volume of the down package, and it is impossible to determine whether the factor affecting the thermal resistance of the down jacket is the down filling amount or the volume of the down package. SUMMARY

[0008] In order to solve the problems existing in the prior art, the present application provides a method for determining the optimal down filling density of down, which comprises the following steps:

[0009] S1. A plurality of cylindrical down storage bins are prepared, each of which has a lower surface with the same area and a different height.

[0010] S2. A down sample with a mass of M is filled into the down storage bin.

[0011] S3. The down storage bin is gently disturbed to ensure uniform distribution of the down.

[0012] S4. The down filling density is calculated and recorded.

[0013] S5. The thermal resistance value of the down storage bin is measured.

[0014] S6, repeat S2-S5, measure the thermal resistance value of each storage warehouse.

[0015] S7, draw the thermal resistance value curve with the change of the filling density, and extract the optimal filling density p of the thermal resistance value reaching the peak value gold .

[0016] By setting different volume of storage warehouse, using the same mass of down sample filling, get the same mass of different filling density sample, can accurately determine the critical point of the best thermal performance of down.

[0017] Further, the storage warehouse is a cuboid.

[0018] Further, each storage warehouse has the same size of the lower surface.

[0019] Further, the length of the lower surface of the storage warehouse is taken from 20-50cm, and the width is taken from 20-50cm.

[0020] Further, the height of the storage warehouse is taken from 1-10cm.

[0021] Further, the filling density is taken from 2-8kg / m3.

[0022] Further, the storage warehouse includes a support frame and a cloth warehouse, and the support frame is arranged in the cloth warehouse.

[0023] Further, the down sample is white goose down with a down content of 90%.

[0024] Further, the loft of the down sample is greater than 800.

[0025] Further, in S2, M is taken from 8-15g.

[0026] The application eliminates the coupling effect of the filling amount and the volume, accurately reveals the relationship between the thermal resistance and the filling density, and locates the critical density point corresponding to the best thermal performance of down. gold Once the p of a certain down is determined, the actual production can be guided, and only by determining the filling amount through the cutting area is too single, and the volume of the down bag and the shrinkage amount of the cloth bag during sewing are also needed to be combined, for example, in the case of fixed filling amount, when the cloth bag has a certain amount of shrinkage, and the volume of the down warehouse and the density of the down can reach the optimal filling density. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only show some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings also belong to the protection scope of the present application.

[0028] Figure 1 is a flowchart of the present application;

[0029] Figure 2 is a relationship curve diagram of the thermal resistance value changing with the filling density in the embodiment of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort also belong to the protection scope of the present application.

[0031] Referring to Figure 1 , the method for determining the optimal filling density of down in the embodiment comprises the following steps:

[0032] S1, a plurality of cylindrical down storage bins are made, each down storage bin has a lower surface with the same area and different heights. In the embodiment, nine kinds of down storage bins are made, and the embodiment is expanded to explain. The down storage bin comprises a supporting frame and a cloth bin, and the supporting frame is arranged in the cloth bin.

[0033] In the embodiment, the shape of the down storage bin is a cuboid, and each down storage bin has a lower surface with the same size. The length of the lower surface is taken from 20-50 cm, and the width is taken from 20-50 cm. The height of the down storage bin is taken from 1-10 cm. In the embodiment, the size of the lower surface is 35 cm*35 cm, and the height is uniformly taken from 2 cm to 5 cm.

[0034] The appropriate down storage bin can also be made according to the required filling density of the experiment, and the filling density is taken from 2-8 kg / m 3 .

[0035] S2, a down sample with a mass of M is filled into the down storage bin. Preferably, M is taken from 8-15 g, and M is 10 g in the embodiment. The down sample adopts white goose down with a down content of 90%, and the loft is greater than 800.

[0036] S3, gently disturb the down storage bin to ensure that the down is uniformly distributed, and avoid local compaction or uneven loft.

[0037] S4, calculate and record the filling density, filling density p = M / V, V is the volume corresponding to the storage warehouse.

[0038] S5, measure the thermal resistance value of the storage warehouse. This embodiment refers to the standard GB / T11048-2008 "Determination of thermal and moisture resistance of textiles under physiological comfort conditions", in the standard environment, using YG606G type thermal resistance and moisture resistance tester to test the thermal resistance value of the down warehouse, the thermal resistance value Rct of the storage warehouse corresponding to the filling density.

[0039] S6, repeat S2-S5, measure the thermal resistance value of each storage warehouse, preferably from low density fluffy state to high density compression state.

[0040] S7, draw the relationship curve of thermal resistance value with filling density, extract the optimal filling density p of the thermal resistance value reaching the peak gold .

[0041] By setting different volume of storage warehouse, using the same mass of down sample filling, get the same mass under different filling density of sample, can accurately determine the best critical point of down warm-keeping performance.

[0042] This embodiment refers to the standard GB / T11048-2008 "Determination of thermal and moisture resistance of textiles under physiological comfort conditions", using YG606G type thermal resistance and moisture resistance tester to test the thermal resistance value of different down bag, the measured data are shown in the following table:

[0043] Density (kg / m 3 )]]> 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6 6.5 Thermal resistance (m 2 K / W) 0.5853 0.5991 0.6304 0.6176 0.6021 0.5949 0.5893 0.5588 0.5147

[0044] Referring to Figure 2 , draw the curve Rct_max = 0.6304 m 2 ·K / W, corresponding to p gold = 3.5 kg / m3.

[0045] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A method for determining the optimal filling density of down, characterized in that: The following steps are involved: S1. Produce several cylindrical down storage bins, each having a lower surface of the same area and different heights; S2. Fill the down storage bin with a down sample of mass M; S3, gently disturb the storage bin; S4. Calculate and record the filling density; S5. Measure the thermal resistance of the down storage bin; S6. Repeat S2-S5 to measure the thermal resistance value of each down storage bin; S7. Draw a curve showing the relationship between thermal resistance and filling density, and extract the optimal filling density ρ at which the thermal resistance reaches its peak value. gold .

2. The method for determining the optimal filling density of down according to claim 1, characterized in that: The down storage bin is in the shape of a cuboid.

3. The method for determining the optimal filling density of down according to claim 2, characterized in that: Each down storage bin has a lower surface of the same size.

4. The method for determining the optimal filling density of down according to claim 3, characterized in that: The length of the lower surface of the down storage bin is 20-50 cm, and the width is 20-50 cm.

5. The method for determining the optimal filling density of down according to claim 4, characterized in that: The height of the down storage bin is 1-10cm.

6. The method for determining the optimal filling density of down according to claim 1, characterized in that: Filling density is 2-8kg / m 3 .

7. The method for determining the optimal filling density of down according to claim 1, characterized in that: The down storage bin comprises a support frame and a down storage bin, wherein the support frame is arranged in the down storage bin.

8. The method for determining the optimal filling density of down according to claim 1, characterized in that: The down sample is white goose down with a down content of 90%.

9. The method for determining the optimal filling density of down according to claim 8, characterized in that: The fill power of the down sample is greater than 800.

10. The method for determining the optimal filling density of down according to claim 9, characterized in that: In S2, M is taken from 8-15g.

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