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30

2021-03

How to deal with bubbles after vulcanization of rubber

How to deal with bubbles after vulcanization of rubber There are always some bubbles on the surface of rubber samples after vulcanization with different sizes.After cutting, there were also a few bubbles in the middle of the sample. Analysis of the causes of bubbles on the surface of rubber products 1.Rubber mixing is not uniform,workers do not operate properly 2.Rubber film parking is not standard, the environment is not sanitary, management is not standard 3.The material is too moist (add calcium oxide when mixing) 4.Insufficient vulcanization, underripe looks bubbly 5.Insufficient vulcanization pressure 6.Vulcanizing agent more impurities, small molecules of impurities decomposed in advance, bubble residual products 7.The exhaust design of the mold itself is unreasonable 8.The product is too thick, the rubber heat transfer is slow, after the appearance of vulcanization, the rubber liquidity decreases, resulting in the lack of material, so it may produce bubbles Solution:To be improved in curing pressure and time 1.Prolong curing time or increase curing speed 2.Increase the number of exhaust during vulcanization

2021-03-30

How to deal with bubbles after vulcanization of rubber

30

2021-03

How to choose different types of oil seals?

How to choose different types of oil seals? The choice of oil seal should be based on the use of medium and working environment， the sealing medium determines the material of the oil seal,the working environment mainly considers the operating pressure and the working line speed and the working temperature range.Therefore,

2021-03-30

How to choose different types of oil seals?

30

2021-03

O-ring's hardness measurement method

O-ring's hardness measurement method is as follows: Measuring instrument Measurement by micro hardness tester to complete, hardness tester should conform to GB/T6032-1985 "vulcanized rubber hardness determination (30-85IRHI) micro test method" test specimen 1.The inner diameter of the standard sample is 14mm±0.17mm.The cross section diameter is 2.65mm±0.09mm, need 3 pieces? 2.For O-rings with a cross section diameter of more than 6mm or an inner diameter of more than 30mm, their segments can be cut and measured, and the results cannot be compared with the standard test results 3.Test procedures Follow the test procedure of GB/T 6032 4.Test result representation:The measured results are 3. Take the middle digit and the whole digit ?

2021-03-30

O-ring's hardness measurement method

30

2021-03

How to measure the size of O-ring

The following two methods are generally used to measure the size of O-ring 1.Projector measurement In short, measure the shadow of the O-ring. We usually choose projector as the measuring tool.In general, O-rings are measured to measure the size of the outside diameter and inside diameter. When do the measurement ,The diameter is measured at the top, bottom, left, and right four points of the O-ring. The following methods are applicable to both the outside and inside diameters of the O-ring 1)In the projector, according to the size of the product to adjust the multiple size of the lens, the lens will be adjusted clearly 2)Place the coordinates on one edge of the O-ring, close to the projector coordinate lines 3)Find the icon marked with a circle on the projector, click the icon, and then press the OK button 4）Move the coordinates to the second point of the o-ring and close the coordinate line to the edge of the O-ring,then press the OK button; And so on, so that after four points of the O-ring, the diameter is measured 2.Optical image measuring instrument,that is to measure the O-ring itself. The method is basically the same as the projector ?

2021-03-30

How to measure the size of O-ring

30

2021-03

Storage Note for O-rings

Storage Note for O-rings O-rings are highly susceptible to various external environmental conditions, We need to know the storage conditions of O-rings in detail, so as to extend the storage time of O-rings. The storage life of seals is determined by the type of rubber material and storage conditions O-rings are susceptible to a variety of external environmental factors，such as, effects of distortion, oxygen, ozone, light, heat, moisture, oil, or chemical solvents,about how to reserve the O-ring, we need ?follow the following rules: 1.Humidity: The relative humidity of the warehouse should be less than 70%, avoid too wet or too dry, avoid condensation phenomenon 2.Temperature: 5-25℃ is the ideal storage temperature.Avoid contact with heat and sunlight 3.Illumination: Avoid direct sunlight or strong artificial light sources with ultraviolet rays. Ultraviolet rays in sunlight and moisture in humid environment can easily lead to aging of rubber sealing materials and changes in material size.UV-proof packaging provides the best protection.Warehouse Windows can be coated with red or orange paint or film 4. Radiation: Avoid ionizing radiation damage to seals 5.Oxygen and ozone: Rubber materials should be protected from exposure to circulating air.Ozone is harmful to most elastomers. The following equipment should be avoided in the warehouse: high-voltage electrical equipment, electric motors and other equipment. 6.Be out of shape: Rubber parts should be placed in a free state as far as possible to avoid stretching, compression or other deformation 7.Contact with liquid or semisolid materials: Do not contact solvents, oils, fats or other semi-solid materials 8.Contact with metallic or nonmetallic materials: Do not touch magnetic materials, cast iron, copper and its alloys, or materials containing materials that can damage rubber.Do not use PVC material to pack seals. Different seal materials should not be mixed. 9.Clean: Clean the seals with soap and water as needed.But water should not contact fiber reinforced seals, rubber metal bonding seals, AU material seals.Disinfectants, organic solvents and tools with sharp edges should not be used.After cleaning the seal should be dry at room temperature, not close to the heat source 10.Packaging: Open the package only when necessary, otherwise it may attach foreign matter or dust, or cause damage. When keeping the unsealed product, please take care not to allow dust to adhere to or mix with it, or cause damage. Repacking the product as original as possible ?

2021-03-30

Storage Note for O-rings
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