CN1194216C - Paper moulding product air permeability measuring apparatus - Google Patents
Paper moulding product air permeability measuring apparatus Download PDFInfo
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- CN1194216C CN1194216C CNB011301678A CN01130167A CN1194216C CN 1194216 C CN1194216 C CN 1194216C CN B011301678 A CNB011301678 A CN B011301678A CN 01130167 A CN01130167 A CN 01130167A CN 1194216 C CN1194216 C CN 1194216C
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- air permeability
- paper moulding
- pressure reduction
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- voltage stabilizing
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Abstract
The present invention provides an air permeability measuring device for paper moulding products, which can measure the permeability of paper moulding products, particularly paper moulding products for packing foods under negative pressure. The air permeability measuring device is comosed of an upper sample air permeation zone and a lower pressure difference formation zone, wherein the sample air permeation zone is composed of a measuring head and a sample fixing device; the pressure difference formatin zone is composed of a voltage stabilization water tank, a pressure difference water column pipe and a water stop valve. The specific method for measuring the permeability comprises: firstly, the water stop valve is closed, and water is injected from a water filling hole till the voltage stabilization water tank is full; then, a sample is placed on the measuring head and fixed by a handle; the water stop valve is opened to measure the volume of water flowing out in certain time. The device has the advantages of simple structure, low cost and convenient and easy measurement operation; the permeability of paper moulding products with different thickness and different shapes can be measured; the air permeability measuring device can be used for measuring the permeability of various paper moulding products to well reflect the quality performance of the products.
Description
Skill this area
The present invention relates to papery product densometer devices such as a kind of determining instrument of moulding product air permeability, particularly moulded pulp set for dining, papery molding packaging material.
Background technology
Air permeability is meant under the unit differential pressure action, in the unit interval by the mean air flow amount of unit area sample or by the needed time of known volume air.Along with the raising of people's environmental consciousness, the paper product that can degrade has obtained exploitation on a large scale, has produced paper products more and more.Wherein have a large amount of paper products to be used for packaging for foodstuff, for making in food fresh keeping need prevent that air from going into, thereby packaging for foodstuff paper products inwall has the rete that blocks air sees through.The mensuration of air permeability is to weigh an important indicator of packaging material for food quality.About the existing corresponding GB assay method (GB 458-79) of the mensuration of air permeability, but this assay method is applicable to and measures thin paper, and it is inapplicable to have certain thickness paper products for some.In addition, measure the method for paper and cardboard air permeability in addition---Ge Erlaifa (GB5402-85), though can measuring, this method has certain thickness cardboard, its measuring principle is to utilize the malleation exhaust.The papery moulding material of packaged food special use is made up of main body papery layer and liner rete.The papery layer is porous, loose, breathable material.Rete is a kind of elasticity, air permeability is less or air-locked dense material, and elastic stretching distortion can take place when gas permeation for it.If adopt this class material air permeability of malleation exhaust measuring, when ply of paper was faced the measurement face of instrument, gas can spill from the side of paper, can't accurately measure air permeability.When rete when the measurement face, gas enters ply of paper from rete because the direction that gas passes through is identical with the direction of film forming, the elastic deformation of film is subjected to ply of paper and stops and diminish.When adopting negative pressure exhaust to measure air permeability, gas enters rete from ply of paper, the direction that gas passes through is opposite with the film forming direction, the thin rete or the rete of film forming inequality are when gas permeation, because of film elasticity deformation stretcher strain, film rupture or intensity might take place weaken and cause air permeability to increase, thereby negative pressure exhaust and malleation exhaust measurement be when having the air permeability of the special-purpose papery moulding material of packaged food of rete, the result understands different.And vacuum or hot press operation are adopted in packaging for foodstuff sealing often, form negative pressure in the packing box, the outside air that influences food fresh keeping at first be under the situation of negative pressure from ply of paper to rete and penetrate rete, inner air and outer air interpenetrates then, influences food storage.Thereby have only adopt negative pressure exhaust could guarantee the air permeability of surveying and the material vacuum or the subnormal ambient that are used adapt.Often run in practice with malleation and measure, the satisfactory paper material of air permeability, situation that but can not be fresh-keeping when being used for vacuum or negative pressure packing.So can not truly reflect the capability and performance of material with malleation air permeability that exhaust is surveyed, thereby be necessary to set up the measuring method of the air permeability of the papery moulding material that is applicable to this class vacuum packaging or fresh-keeping packaging.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can under negative pressure, measure paper moulding product air permeability measuring apparatus device, the particularly determining instrument of packaging for foodstuff paper products air permeability.
For achieving the above object, the present invention is according to forming at water column under the effect of Negative Pressure Difference, the measuring principle that the airshed of air by sample equals discharge carries out the structural design of instrument, and the structure of instrument forms district's two parts by upper sample ventilating area and bottom pressure reduction and forms; Said sample ventilating area part is made of measuring head and sample fixing device, there is a groove upper surface of said measuring head, to the axis direction of lower edge measuring head one small-bore duct is arranged from this groove, the other pipe of water that adds that has a transparent band water valve at the sidewall of measuring head feeds duct in the measuring head; Said pressure reduction forms district's part and is made of voltage stabilizing tank, pressure reduction water column pipe and sealing valve, said voltage stabilizing tank is connected under the measuring head, there is the inner chamber of a groove and voltage stabilizing tank the upper surface of the hole link measuring head in the measuring head, pressure reduction water column pipe is installed in the bottom of voltage stabilizing tank, the internal diameter of voltage stabilizing tank is more than or equal to 3 times of pressure reduction water column pipe, and the sealing valve is installed in the water side of pressure reduction water column pipe.
The sample fixing device of described sample ventilating area part is in order to fixedly to place the sample on the measuring head end face when measuring, can adopt following structure, form sample fixing device by pressing down handle, push-down head, push-down head center sleeve, spring, fixed handle and fixed handle support spring, push-down head is a hollow, be fixed on and press down on the handle, in the push-down head center sleeve bleeder vent is arranged, this casing pipe sleeve is in push-down head, push-down head center sleeve lower end is connected and fixed ring plate over against measuring head, and spring housing is on the push-down head center sleeve.During measurement, sample is positioned on the measuring head end face, press down handle, press down handle and make the push-down head center sleeve to lower compression by push-down head, the while compression spring, the push-down head center sleeve is pushed down sample by fixed ring piece, fix (the fixed handle support spring is used for the support fixation handle) by fixed handle pressing down handle, can be fixed on sample on the measuring head end face, unclamp fixed handle, sample can take off.
Described voltage stabilizing tank can be designed to a cylindrical shape, and its interior diameter is 100～150mm, and height is 10～50cm, and the interior diameter of pressure reduction water column pipe is 20～30mm.
The diameter in the duct in the described measuring head is 8～12mm.
Described sealing valve can adopt the piston of buret.
The described other pipe of water that adds can adopt glass material, and water valve wherein can coloured silk be a piston.
Described pressure reduction water column pipe can be connected with the jacket pipe that goes out of voltage stabilizing bottom of gullet by a gum cover, so that change the pressure reduction water column pipe of different size as required.
The material of described voltage stabilizing tank and pressure reduction water column pipe preferably adopts organic glass.
The concrete grammar of measuring air permeability is as follows: at first close the sealing valve, inject water from the filler full to the voltage stabilizing tank.Then sample is placed on the measuring head, is fixed by handle, at this moment gas can see through the groove that sample enters the measuring head end face by the bleeder vent in the push-down head center sleeve, opens the sealing valve, measures the volume that flows out water within a certain period of time.The sample bigger to air permeability can be measured from the voltage stabilizing tank and flow out 100 ml water required times.The sample little to air permeability, measurable flow go out 10 milliliters or 1 milliliter of required time.Repeated measurement 2～3 times, the air permeability of the institute's test specimens area of averaging that to be this sample see through under fixing pressure reduction.
Densometer provided by the present invention can be to paper moulding product under negative pressure, particularly the air permeability of the papery moulding material that is used for packaged food is measured, and this apparatus structure is simple, and cost is low, and measuring operation is convenient and easy.Can carry out air permeability to the paper moulding product of different-thickness, shape and measure,,, can reflect the capability and performance of this series products preferably especially for the air permeability of the papery moulding material goods of packaged food with this Instrument measuring paper moulding product.
Description of drawings
Fig. 1 is the structural representation of instrument of the present invention;
Fig. 2 is the A partial enlarged drawing of Fig. 1.
Embodiment
Below be described in further detail by the CONSTRUCTED SPECIFICATION of accompanying drawing embodiment of the present invention:
As accompanying drawing 1, shown in 2, the sample ventilating area part of this densometer device is by the measuring head 7 of stainless steel with by pressing down handle 1, push-down head 2, push-down head center sleeve 3, spring 5, the sample fixing device that fixed handle 4 and fixed handle support spring 6 are formed constitutes, 31 is the center bleeder vent of push-down head center sleeve 3,32 for being connected the fixed ring piece of push-down head center sleeve 3 lower ends, the upper surface of measuring head 7 fluted 71, have the aperture road 72 that the aperture is 10mm along central axis direction, the other pipe 10 of water that adds that lower sidewall is equipped with a glass feeds aperture road 72, and adding on the other pipe of water has Water valve with piston rod 11.Voltage stabilizing tank 8 is made by organic glass by pressure reduction formation district and pressure reduction water column pipe 9 is formed, voltage stabilizing tank 8 is an internal diameter 100mm, height is the cylindrical shape of 10cm, with measuring head 7 by being threaded, pressure reduction water column pipe 9 internal diameters are 20mm, long is 90cm, is contained on the water delivering orifice of voltage stabilizing bottom of gullet, and buret stopcock 13 is equipped with as the sealing valve in the bottom of water column pipe.The member of whole instrument is fixed on the instrument support 12.
With the air permeability of this Instrument measuring mess-tin 15 bottoms, at first close sealing valve 13, it is full to the voltage stabilizing tank to inject water in voltage stabilizing tank 8 and pressure reduction water column pipe 9.Sample 15 is placed on the measuring head, fixedly sample.Open the sealing valve, and begin to use manual time-keeping t
1=0, collect the water that flows out with graduated cylinder 14, when water flows out 100 milliliters, timing t
2=4 minutes 56 seconds.Air permeability is calculated as follows:
D＝32.5/(t
2-t
1)＝32.5/296＝0.11
Wherein 32.5 are the experiment coefficient, and air permeability D unit is μ m/ (Pa.s).
Claims (8)
1, a kind of paper moulding product air permeability measuring apparatus is characterized in that forming district's two parts by upper sample ventilating area and bottom pressure reduction forms; Said sample ventilating area part is made of measuring head (7) and sample fixing device, there is a groove (71) upper surface of said measuring head (7), to the axis direction of lower edge measuring head one small-bore duct (72) is arranged from this groove, the other pipe of water (10) that adds that has a transparent band water valve at the sidewall of measuring head (7) feeds duct (72); Said pressure reduction forms district's part and is made of voltage stabilizing tank (8), pressure reduction water column pipe (9) and sealing valve (13), said voltage stabilizing tank (8) is connected under the measuring head (7), there is the inner chamber of a groove (71) and voltage stabilizing tank (8) upper surface of duct (72) the connection measuring head in the measuring head (7), pressure reduction water column pipe (9) is installed in the bottom of voltage stabilizing tank (8), the internal diameter of voltage stabilizing tank (8) is more than or equal to 3 times of pressure reduction water column pipe (9), and sealing valve (13) is installed in the water side of pressure reduction water column pipe (9).
2, paper moulding product air permeability measuring apparatus according to claim 1, the sample fixing device that it is characterized in that described sample ventilating area part is by pressing down handle (1), push-down head (2), push-down head center sleeve (3), spring (5), fixed handle (4) and fixed handle support spring (6) are formed, said push-down head (2) is a hollow, be fixed on and press down on the handle (1), bleeder vent (31) is arranged in the push-down head center sleeve (3), this casing pipe sleeve is in push-down head (2), push-down head center sleeve lower end is connected and fixed ring plate (32) over against measuring head, and spring (5) is enclosed within on the push-down head center sleeve.
3, paper moulding product air permeability measuring apparatus according to claim 1 is characterized in that described voltage stabilizing tank (8) is a cylindrical shape, and its interior diameter is 100～150mm, and height is 10～50cm, and the interior diameter of pressure reduction water column pipe (9) is 20～30mm.
4, paper moulding product air permeability measuring apparatus according to claim 1 is characterized in that the diameter in the duct (72) in the described measuring head (7) is 8～12mm.
5, paper moulding product air permeability measuring apparatus according to claim 1 is characterized in that described sealing valve (13) adopts the piston of buret.
6, paper moulding product air permeability measuring apparatus according to claim 1 is characterized in that the described water valve that adds the other pipe of water (10) is a piston.
7, paper moulding product air permeability measuring apparatus according to claim 1 is characterized in that described pressure reduction water column pipe (9) is connected by the jacket pipe that goes out of a gum cover with voltage stabilizing tank (8) bottom.
8, paper moulding product air permeability measuring apparatus according to claim 1 is characterized in that the material of described voltage stabilizing tank (8) and pressure reduction water column pipe (9) is an organic glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011301678A CN1194216C (en) | 2001-12-31 | 2001-12-31 | Paper moulding product air permeability measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011301678A CN1194216C (en) | 2001-12-31 | 2001-12-31 | Paper moulding product air permeability measuring apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1430054A CN1430054A (en) | 2003-07-16 |
| CN1194216C true CN1194216C (en) | 2005-03-23 |
Family
ID=4669792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011301678A Expired - Fee Related CN1194216C (en) | 2001-12-31 | 2001-12-31 | Paper moulding product air permeability measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1194216C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852713B (en) * | 2009-04-06 | 2012-05-09 | 潍坊恒联玻璃纸有限公司 | Method for measuring water vapor penetrability of glass paper |
| CN108918374B (en) * | 2018-05-11 | 2021-09-21 | 上海大学 | Device and method for testing air permeability of underground interlayer |
-
2001
- 2001-12-31 CN CNB011301678A patent/CN1194216C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1430054A (en) | 2003-07-16 |
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