CN104527011A - A kind of PEI plastic plate production process - Google Patents

Abstract

A production process of a PEI plastic plate sequentially comprises the following steps: feeding, drying, plasticizing and extruding, molding/shaping, feeding and drying: drying by circulating hot air; plasticizing and extruding, namely, continuously extruding the PEI raw material after the PEI raw material is uniform through the temperature of a machine barrel and a screw; the molding/shaping is that the parison with a certain shape is molded and shaped by the rotary extrusion of the screw and then is extruded out of the mold; during plasticizing extrusion, the machine barrel is heated in three zones, so that the melt keeps certain viscosity for forming, namely: a first area: 320-330 ℃ two regions: 310-320 ℃ three region: 300-310 ℃ linker: 290 ℃ and 300 ℃, extrusion screw speed: 8-10 r/min. The plasticizing extrusion process changes the traditional mode from low to high by changing the heating mode of the plasticizing extrusion process, gradually reduces the temperature by using the mode from high to bottom, has increasingly poor flowability of raw materials, and does not generate glue overflow phenomenon when glue explosion is increased for extrusion.

Description

A kind of PEI plastic plate production process

technical field

The invention relates to the technical field of PEI processing technology, in particular to a PEI plastic plate production technology.

Background technique

PEI board extrusion molding is to add granular materials into the barrel of the extruder from the hopper, and the materials are conveyed forward and compacted by the friction between the inner wall of the barrel and the surface of the screw under the extrusion force of the screw rotation. The heating device and friction preheating on the outside of the barrel melt and plasticize under high temperature and high pressure conditions. Then, the continuously rotating screw pushes the molten material into the mold of the die, and the molten material extruded from the die is cooled and shaped into the desired PEI product. PEI board extrusion molding is to add granular materials into the barrel of the extruder from the hopper, and the materials are conveyed forward and compacted by the friction between the inner wall of the barrel and the surface of the screw under the extrusion force of the screw rotation. The heating device and friction preheating on the outside of the barrel melt and plasticize under high temperature and high pressure conditions. Then, the continuously rotating screw pushes the molten material into the mold of the die, and the molten material extruded from the die is cooled and shaped into the desired PEI product.

Contents of the invention

The purpose of the invention is to overcome the defects of the prior art, and provide a PEI plastic plate production process with good extrusion effect and low power consumption.

The present invention is achieved in this way: a PEI plastic plate production process, which includes the following steps in turn: feeding, drying, plasticizing and extruding, forming/setting

Feeding, put the PEI raw material into the processing device,

Drying: Dry the PEI raw material by circulating hot air at 120°C, the drying time is 4-6H, so that the moisture content in the PEI raw material is 0.2-0.3%;

Plasticizing extrusion, PEI is melted evenly through the barrel, and then extruded continuously through the screw;

Forming/setting is due to the rotary extrusion of the screw, so that the uniform melt with fluidity enters the machine head through the perforated plate, and is formed according to a certain shape of the parison, and then it is extruded out of the mold after being shaped;

When plasticizing and extruding, the barrel is heated in three zones so that the melt can be molded with a certain viscosity, namely:

Zone 1: 350-360°C

Zone 2: 340-350°C

Zone 3: 330-340°C

Joint: 320-330°C

Extrusion screw speed: 15-18r/min

Wherein, the feeding end of the extrusion barrel is cooled by circulating water by setting a water circulation cooling device.

The beneficial effects of the present invention are:

A kind of PEI plastic plate production process, comprises the following steps in turn: feeding, drying, plasticizing and extruding, shaping/setting

Feeding, put the PEI raw material into the processing device,

Drying: Dry the PEI raw material by circulating hot air at 120°C, the drying time is 4-6H, so that the moisture content in the PEI raw material is 0.2-0.3%;

Plasticizing extrusion, PEI is melted evenly through the barrel, and then extruded continuously through the screw;

Forming/setting is due to the rotary extrusion of the screw, so that the uniform melt with fluidity enters the machine head through the perforated plate, and is formed according to a certain shape of the parison, and then it is extruded out of the mold after being shaped;

When plasticizing and extruding, the barrel is heated in three zones so that the melt can be molded with a certain viscosity, namely:

Zone 1: 350-360°C

Zone 2: 340-350°C

Zone 3: 330-340°C

Joint: 320-330°C

Extrusion screw speed: 8-10r/min.

In the plasticizing extrusion process of the present invention, by changing the heating method, the traditional method from low to high is changed, and the temperature is gradually reduced by using the method from high to low, so that the fluidity of the raw materials meets the requirements of the process. In the best state, when pressurized for extrusion, there will be no glue burst or overflow, and the purpose of improving output and quality will be achieved at the same time.

Detailed ways

A kind of PEI plastic plate production process, comprises the following steps in turn: feeding, drying, plasticizing and extruding, shaping/setting

Feeding, put the PEI raw material into the processing device,

Drying: Dry the PEI raw material by circulating hot air at 120°C, the drying time is 4-6H, so that the moisture content in the PEI raw material is 0.2-0.3%;

Plasticizing extrusion, PEI is melted evenly through the barrel, and then extruded continuously through the screw;

Forming/setting is due to the rotary extrusion of the screw, so that the uniform melt with fluidity enters the machine head through the perforated plate, and is formed according to a certain shape of the parison, and then it is extruded out of the mold after being shaped;

When plasticizing and extruding, the barrel is heated in three zones so that the melt can be molded with a certain viscosity, namely:

Zone 1: 350-360°C

Zone 2: 340-350°C

Zone 3: 330-340°C

Joint: 320-330°C

Extrusion screw speed: 15-18r/min

In the plasticizing extrusion process of the present invention, by changing the heating method, the traditional method from low to high is changed, and the temperature is gradually reduced by using the method from high to low, so that the fluidity of the raw materials meets the requirements of the process. In the best state, when pressurized for extrusion, there will be no glue burst or overflow, and the purpose of improving output and quality will be achieved at the same time.

Wherein, the feeding end of the extrusion barrel is cooled by circulating water by setting a water circulation cooling device. To achieve uniform feeding, to avoid the problem of no feeding or uneven feeding.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (2)

1. a PEI plastic plate production technology, is characterized in that, comprises the following steps successively: feed intake, and dry, plasticizing is extruded, shaping/sizing, heat preservation hot process;

Feed intake, PEI raw material dropped into processing unit (plant),

Dry: carry out drying by 120 DEG C of circulating airs to PEI raw material, drying time, 4-6H, made the water content in PEI raw material be 0.2-0.3%;

Plasticizing is extruded, and by barrel by after PEI fusing evenly, through screw rod, is extruded continuously;

Shaping/sizing is rotary squeezing due to screw rod, makes the improving uniformity of melt with mobility enter head by porous plate, and is extruded mould by after the type embryo forming of definite shape, sizing;

When plasticizing is extruded, point 3rd district heat to machine barrel, and just melt keeps certain viscosity shaping, that is:

One district: 350-360 DEG C

2nd district: 340-350 DEG C

3rd district: 330-340 DEG C

Joint: 320-330 DEG C

Extrusion screw rod speed: 15-18r/min.

2. a kind of PEI plastic plate production technology according to claim 1, is characterized in that: carry out recirculated water cooling by arranging water circulation cooling device to the feeding end extruding barrel.