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Plastic front case, LCD TV and manufacturing method for plastic front case

A manufacturing method and technology of the front shell, applied in the field of television, can solve the problems of large damage to the side wall of the mold, unguaranteed product quality, and affecting production efficiency, etc., achieve uniform molecular arrangement in all directions, stable dimensions, and solve drag problems. The effect of injury

Inactive Publication Date: 2019-04-26
TCL KING ELECTRICAL APPLIANCES HUIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The size, deformation and structural strength of the glass fiber reinforced material are good, but in the production process, because the hardness of the glass fiber is greater than that of the mold steel, it still maintains a small strip shape under the filling state of the plastic melt, which has a negative effect on the side wall of the mold. According to statistics, the dragging and polishing time of a single machine is close to 1 hour per day. Frequent shutdowns not only affect production efficiency, but also cannot guarantee product quality.

Method used

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  • Plastic front case, LCD TV and manufacturing method for plastic front case

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment proposes a plastic front case, the preparation method of which includes the following steps:

[0032] S1, 30g polycarbonate (PC), 30g ABS (acrylonitrile-butadiene-styrene copolymer) and 10g talcum powder are mixed, obtain composite material; Injection molding system and injection mold are preformed Treatment: Heat the barrel temperature in the injection molding system to 240°C, heat the hot runner to 265°C, heat the mold temperature machine for the fixed mold to 65°C, use an oven to dry the composite material for 4 hours, and then heat it to 80°C, Add the pretreated composite material into the preheated barrel and heat it to a molten state;

[0033] S2. Use the steam control equipment to heat the surface temperature of the clamped mold to 125°C (or set the steam heating time to 15s), and inject the molten composite material through the nozzle of the hot runner processed in step S1 to heat up In the final mold, and the injection process is divided into f...

Embodiment 2

[0037] This embodiment proposes a plastic front case, the preparation method of which includes the following steps:

[0038]S1. Mix 50g polycarbonate (PC), 50g ABS and 20g talcum powder to obtain a composite material; pretreat the injection molding system and the injection mold: heat the barrel temperature in the injection molding system to 260°C, and heat the hot runner to 275°C, heat the mold temperature machine of the mold to 75°C, use an oven to dry the composite material for 5 hours, and then heat it to 90°C, add the pre-treated composite material to the pre-heated barrel, and heat to melt state;

[0039] S2. Use the steam control equipment to heat the surface temperature of the clamped mold to 140°C (or set the steam heating time to 25s), and inject the molten composite material through the nozzle of the hot runner processed in step S1 to heat up In the final mold, and the injection process is divided into four stages: the injection pressure of the first stage is 120kgf...

Embodiment 3

[0043] This embodiment proposes a plastic front case, the preparation method of which includes the following steps:

[0044] S1. Mix 40g polycarbonate (PC), 40g ABS and 15g talcum powder to obtain a composite material; pretreat the injection molding system and the injection mold: heat the barrel temperature in the injection molding system to 250°C, and heat the hot runner to 270°C, heat the mold temperature machine of the mold to 70°C, use an oven to dry the composite material for 4.5 hours, and then heat it to 85°C, add the pretreated composite material to the preheated barrel, and heat to molten state;

[0045] S2. Use the steam control equipment to heat the surface temperature of the clamped mold to 130°C (or set the steam heating time to 20s), and inject the molten composite material through the nozzle of the hot runner processed in step S1 to heat up In the final mold, and the injection process is divided into four stages: the injection pressure of the first stage is 120...

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Abstract

The invention discloses a plastic front case, an LCD TV and a manufacturing method for plastic front case. Specifically, the plastic front case is prepared from, by weight, 30-50 parts of polycarbonate, 30-50 parts of ABS, and 10-20 parts of talcum powder. The method includes the steps that (1), the 30-50 parts of polycarbonate, the 30-50 parts of ABS, and the 10-20 parts of talcum powder are mixed to obtain a composite material, an injection molding system and an injecting mold are pre-treated, and the composite material is added into the injecting system after drying and then fully melted; (2), the surface of a fixed half of a molded mold-set is heated to be at the temperature of 125 DEG C to 140 DEG C, and the composite material staying in molten status is injected into the shaping cavity of the mold at constant pressure; and (3), the product is taken out from the mold after cooling and shaping for 20 to 30 seconds. Damage to the molding block is small in the process of the meltingand filling of the composite material, and thus the problem of damage to the case face caused by dragging is solved effectively.

Description

technical field [0001] The invention relates to the field of televisions, in particular to a plastic front case, a liquid crystal television and a method for manufacturing the plastic front case. Background technique [0002] With the rapid development of LCD TV technology, many new technologies emerge in an endless stream, and the shape of products is also developing in the direction of thin, large and dazzling. Many high-end TVs have also made great efforts in product appearance design: metal frame, laser engraving, bronzing, etc., the cool appearance attracts the attention of mid-to-high-end customers, but in the low-end product application market, plastic front shell + fuel injection + Due to its natural low cost advantage, silk screen printing still has a natural irreplaceability. [0003] The traditional structure of the plastic front shell of LCD TV is an L-shaped integrated frame, and the glue is injected through a straight gate or a point gate on the side wall. Mos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/76B29C45/78B29C45/77B29C45/00C08L69/00C08L55/02C08K3/34B29K69/00B29K55/02
CPCB29C45/0001B29C45/76B29C45/77B29C45/78B29C2945/76498B29C2945/76531B29C2945/76595B29K2055/02B29K2069/00C08L55/02C08L69/00C08K3/34
Inventor 郑培忠殷维正赵林炳郑云飞柳争荣
Owner TCL KING ELECTRICAL APPLIANCES HUIZHOU
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