In the injection molding production process, what are the reasons for the residual glue in the mold?
Mainly analyze and judge the reasons for the defects of the current molded products. Provide reference factors in the molding machine, mold and raw materials to effectively control the defects and reduce production costs.
Content:
1 Sores: (Silver streaks) The
surface of the finished product, centered on CATE, has many silver-white streaks, which are basically produced along the flow direction of the raw materials. This phenomenon occurs after many bad conditions have accumulated, and sometimes it is difficult to grasp the real cause.
1.1 If there is moisture or other volatile components in the raw material, and it is not fully dried, a lot of silver bars will be produced on the surface.
1.2 When other raw materials are accidentally mixed into the raw materials, sores will also form, and the shape is mica-like or pinpoint-like, which is easy to distinguish from the sores caused by other reasons.
1.3 This situation is also prone to occur when the raw materials or the material pipe are not clean.
1.4 The injection time is long, and the temperature of the raw materials injected into the mold cavity is low at the initial stage. As a result of curing, the volatile components will not be eliminated, especially for the temperature-sensitive raw materials, this situation often occurs.
1.5 If the mold temperature is low, the raw material solidifies quickly and easily occurs (1.4), so that the volatile components will not be discharged.
1.6 When the mold is poorly exhausted, the gas cannot be easily removed when the raw materials enter, and sores will occur. In this situation, the top of the finished product will often burn black.
1.7 If moisture adheres to the mold, the heat from the filling material will evaporate it and fuse with the molten material to form a sore, which is in the form of an egg white mist.
1.8 There is cold material in the cold material cavity of the glue channel or small. When it is injected, the cooled material is brought into the mold cavity, and a part of it will quickly solidify to form a thin layer. When the mold temperature is low at the beginning of production, it will also cause sores.
1.9 During the filling process of raw materials, a thin layer is formed due to the rapid cooling of the contact part of the cavity surface, which is melted and decomposed by the following raw materials to form a white or stain-like shape, which is more common in thin-shell products.
1.10 When filling, the raw material becomes turbulent, which can extend the flow path of the raw material, and is affected by the structure of the cavity to produce friction. The filling speed is faster than the cooling speed of the raw material. The gate position is at the bone or small, which is easy to cause sores. Sores are also prone to occur where the thickness of the finished meat increases sharply.
1.11 The gate and flow channel are small or deformed, and the filling speed is fast, and friction occurs instantly, which causes the temperature to rise rapidly and causes the raw material to decompose.
1.12 The raw materials contain recycled materials, which are not fully dried and decompose during injection, causing sores.
1.13 The raw material stays in the material pipe for a long time, causing partial overheating and decomposition.
1.14 Insufficient back pressure, entrapped air (insufficient compression ratio).
Choose basket mould to https://www.msplasticmold.com/product/cratesbaskets/
Mainly analyze and judge the reasons for the defects of the current molded products. Provide reference factors in the molding machine, mold and raw materials to effectively control the defects and reduce production costs.
Content:
1 Sores: (Silver streaks) The
surface of the finished product, centered on CATE, has many silver-white streaks, which are basically produced along the flow direction of the raw materials. This phenomenon occurs after many bad conditions have accumulated, and sometimes it is difficult to grasp the real cause.
1.1 If there is moisture or other volatile components in the raw material, and it is not fully dried, a lot of silver bars will be produced on the surface.
1.2 When other raw materials are accidentally mixed into the raw materials, sores will also form, and the shape is mica-like or pinpoint-like, which is easy to distinguish from the sores caused by other reasons.
1.3 This situation is also prone to occur when the raw materials or the material pipe are not clean.
1.4 The injection time is long, and the temperature of the raw materials injected into the mold cavity is low at the initial stage. As a result of curing, the volatile components will not be eliminated, especially for the temperature-sensitive raw materials, this situation often occurs.
1.5 If the mold temperature is low, the raw material solidifies quickly and easily occurs (1.4), so that the volatile components will not be discharged.
1.6 When the mold is poorly exhausted, the gas cannot be easily removed when the raw materials enter, and sores will occur. In this situation, the top of the finished product will often burn black.
1.7 If moisture adheres to the mold, the heat from the filling material will evaporate it and fuse with the molten material to form a sore, which is in the form of an egg white mist.
1.8 There is cold material in the cold material cavity of the glue channel or small. When it is injected, the cooled material is brought into the mold cavity, and a part of it will quickly solidify to form a thin layer. When the mold temperature is low at the beginning of production, it will also cause sores.
1.9 During the filling process of raw materials, a thin layer is formed due to the rapid cooling of the contact part of the cavity surface, which is melted and decomposed by the following raw materials to form a white or stain-like shape, which is more common in thin-shell products.
1.10 When filling, the raw material becomes turbulent, which can extend the flow path of the raw material, and is affected by the structure of the cavity to produce friction. The filling speed is faster than the cooling speed of the raw material. The gate position is at the bone or small, which is easy to cause sores. Sores are also prone to occur where the thickness of the finished meat increases sharply.
1.11 The gate and flow channel are small or deformed, and the filling speed is fast, and friction occurs instantly, which causes the temperature to rise rapidly and causes the raw material to decompose.
1.12 The raw materials contain recycled materials, which are not fully dried and decompose during injection, causing sores.
1.13 The raw material stays in the material pipe for a long time, causing partial overheating and decomposition.
1.14 Insufficient back pressure, entrapped air (insufficient compression ratio).
Choose basket mould to https://www.msplasticmold.com/product/cratesbaskets/
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