Paper moulding product air permeability measuring apparatus

A technology for molded products and air permeability, which is applied in the field of air permeability measurement instruments for molded products, can solve the problem that air permeability cannot truly reflect material quality performance, etc. Effect

Inactive Publication Date: 2003-07-16
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

Therefore, the air permeability measured by positive pressure exhaust cannot truly reflect the quality and performance of the material, so it is necessary

Method used

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  • Paper moulding product air permeability measuring apparatus
  • Paper moulding product air permeability measuring apparatus

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Embodiment Construction

[0016] The structural details of the embodiments of the present invention are further described in detail by the accompanying drawings:

[0017] As shown in accompanying drawings 1 and 2, the air permeability area of ​​the sample of the gas permeability measuring instrument consists of a measuring head 7 made of stainless steel and a lower pressure handle 1, a lower pressure head 2, a lower pressure head center sleeve 3, a spring 5, The sample fixing device composed of the fixed handle 4 and the fixed handle support spring 6 is composed of, 31 is the central air hole of the center sleeve 3 of the lower pressure head, 32 is the fixed ring piece connected to the lower end of the center sleeve 3 of the lower pressure head, and the measuring head 7 There is a groove 71 on the upper end surface of the upper end, and a small hole 72 with a diameter of 10 mm is provided along the central axis, and a glass water-adding bypass pipe 10 is installed on the lower part of the side wall to l...

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Abstract

An apparatus for measuring the air permeability of a moulded paper product under negative pressure is composed of the upper air permeable region of specimen, which consists of measuring head and fixing unit, and the lower pressure difference generating region comprising pressure stabilized water tank, pressure-difference vertical water tube, and sealing-up valve. Its measuring method includes such steps as closing sealing-up valve, filling water in water tank, fixing specimen to measuring head, opening the sealing-up valve, and measuring the water volume flowing out within a certain time. Its advantages are simple structure, low cost and easy operation.

Description

technical field [0001] The invention relates to an instrument for measuring the air permeability of molded products, in particular to an instrument for measuring the air permeability of paper products such as pulp molded tableware and paper molded packaging materials. Background technique [0002] Air permeability refers to the average air flow through a unit area of ​​a sample per unit time or the time required to pass through a known volume of air under the action of a unit pressure difference. With the improvement of people's awareness of environmental protection, degradable paper products have been developed on a large scale, and more and more paper products have been produced. Among them, a large number of paper products are used for food packaging. In order to keep food fresh, it is necessary to prevent air from entering. Therefore, the inner wall of food packaging paper products has a film layer that prevents air from passing through. The determination of air permeab...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 欧义芳符超马志君
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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