PS transparent styrene (commonly known as hard glue)

first,After 24 hours of immersion, it only absorbs 0.04% water.

second,Fragile, flammable, and prone to aging. Long term exposure to sunlight can cause yellowing and fading.

third,PS will sink in water, and when heated with fire, it will soften and burn, emitting a black yellow flame and odor. After the fire is extinguished, the odor is particularly prominent, and no other materials are needed for cleaning.

fourth,Shrinkage is 0.4%, and after adding 25% GF glass fiber, it is 0.2%.

fifth,Dry at 70 ℃ (2-3H). Dry the raw beer plastic for 2 hours, and when adding the water inlet material or in humid weather (February to May) for 3 hours.

sixth,Beer metal inlay: Preheat the metal to 80 ℃~120 ℃, remove oil, and have grooves on the outer layer.

seventh,Applicable universal screws: L: D=18:1

eighth,Melt adhesive temperature: 200 ℃~250 ℃ a. High temperature will reduce the quality orientation, thus enhancing its resistance to breakage (such as during ejection) and heat deformation. b、 If the temperature is 250 ℃, the residence time of the material cannot exceed 5 minutes, and if it is 275 ℃, it cannot exceed 1-2 minutes.

ninth,Pay attention to the control of hydraulic fluid temperature, material temperature, plastic temperature, and mold temperature.

tenth,Temperature setting: Rear: 150-180 ℃, Middle: 180-230 ℃, Middle: 210-250 ℃, Front: 210 ℃~280 ℃, Nozzle: 210-280 ℃, Mold: 10-80 ℃

eleventh,Shooting speed: High speed (no need for high pressure)

twelfth,Rotational speed: can be very high (preferably in conjunction with the cycle)

thirteenth,Back pressure: usually use low back pressure (can be combined with colored beer)

PP polypropylene

Commonly known as Baifolded glue, abbreviated as:PP、PPR、PPN、PP-N、PP-K、PP-C、PP-HO、PP-CO

first,The hot deformation temperature is 100 ℃, and it can withstand boiling water, steam, and disinfection.

second,After heating with a flame, it melts at about 170 ℃, and the flame emits a faint light with a blue to yellow color. It still burns after leaving the flame, with a smell like a candle. It does not need to be cleaned with other materials when stopping the machine.

third,Shrinkage: PP is a semi crystalline thermal material with a shrinkage rate of 1.8%~2.5%. It shrinks 8.5% within 24 hours and 98% in the first week. It is completed by placing it in boiling water for 1 hour. Note: If the shrinkage time is too long, it indicates an error in the injection molding process (such as high mold temperature, too low glue temperature, or too high pressure). If there is no excessive deformation after 15 minutes of boiling water, it indicates that there is no problem in the injection molding process.

fourth,Adding 30% fiberglass (named PPGF30) can reduce the shrinkage to 0.7%.

fifth,Cannot be exposed to outdoor light, it will be dissolved by aromatic or chlorinated carbon at a high temperature of 85 ℃; Contact with copper containing mixed plastics at high temperatures can lead to decomposition.

sixth,PP is a semi crystalline thermal material with a mold temperature of 50 ℃, and can be used with universal screws (L: D=20:1).

seventh,Gel temperature: 220-275 ℃, do not exceed 275 ℃, otherwise the viscosity will change dramatically and oxidation will occur.

eighth,The retention time of the barrel material should not exceed 5-6 minutes at 260 ℃ and 2-3 minutes at 270 ℃.

ninth,Temperature setting values: rear: 190~230 ℃, middle: 200~240 ℃, middle: 210~260 ℃, front: 220 ℃~270 ℃, nozzle: 220~270 ℃, mold: 30~80 ℃.

tenth,Shooting speed: High speed (can reduce internal stress and deformation). If there are wrinkles on the surface of the mold, low speed and high mold temperature can be used for surface problems, and high pressure can be used.

eleventh,Screw speed: In accordance with the cycle, the lower the back pressure, the better.

HDPE high-density polyethylene (commonly known as hard soft rubber)

first,HDPE is a semi crystalline thermoplastic with a shrinkage rate ranging from 2.0% to 5.0%, or even 5%. The mold temperature has a significant impact on the degree of shrinkage and must be stable.

second,The mold temperature should be 20 ℃, and within 24 hours at this temperature, the water absorption of the product should be 0.01%. If necessary, bake at 65 ℃ for 3 hours. Dry the raw beer plastic for 2 hours, and bake for 3 hours when adding water additives or when the weather is humid from February to May.

third,Universal screws (L: D=20:1) can be used.

fourth,Maintaining pressure for a long time can ensure the stability of the product.

fifth,When heated, it is easy to burn, with a blue to yellow flame and only a small amount of smoke. There are burning glue droplets falling, which emit a wax smell when extinguished.

sixth,Applicable temperature: 220-260 ℃. If the temperature is 270 ℃, the shutdown cylinder cannot exceed 5-6 minutes. If the temperature is 280 ℃, it cannot exceed 2-3 minutes.

seventh,Temperature setting: Rear: 160-200 ℃, Middle: 170-230 ℃, Middle: 200-260 ℃, Front: 220-280 ℃, Mouth: 210-270 ℃, Mold: 10-60 ℃.

eighth,Shooting speed: High speed injection molding or multi-stage injection molding injection molding can be used.

ninth,Screw speed matching cycle: The lower the back pressure, the better.

LDPE Low Density Polyethylene (commonly known as Soft Glue Flower Material)

first,High shrinkage: 1.5%~5.0%

second,When heated, it is easy to burn, with a blue to yellow flame and only a small amount of smoke. There are burning glue droplets falling, which emit a wax smell when extinguished.

third,The best mold temperature is 30 ℃. After 24 hours at room temperature, it absorbs 0.02% water. If necessary, it can be baked at 65 ℃ for 3 hours. The glue temperature should be between 180-280 ℃. Dry the raw beer plastic for 2 hours, and bake for 3 hours when adding water or humid weather from February to May.

fourth,Universal screws (L: D=20:1) can be used.

fifth,Material shutdown time: At 270 ℃, the material retention time should not exceed 5-6 minutes, and at 285 ℃, it should not exceed 2-3 minutes.

sixth,Temperature setting: Rear: 120~200 ℃, Middle: 160~230 ℃, Middle: 180~260 ℃, Front: 200~280 ℃, Mouth: 210~270 ℃, Mold: 10~60 ℃.

seventh,High speed glue injection or multi-stage glue injection can be used.

eighth,Screw speed matching cycle: The lower the back pressure, the better.

PVC（UPVC、RPVC、PVC-U）

first,The best mold temperature is 40 ℃. The shrinkage rate of coarse powder is 0.1~0.5%, and the shrinkage rate of fine powder is 1.5%.

second,After 24 hours at room temperature, absorb 0.02% water. If necessary, bake at 65 ℃ for 3 hours, with a glue temperature between 180~205 ℃. Dry the raw beer plastic for 2 hours, and bake it for 3 hours when adding water or when the weather is humid from February to May.

third,Heating with fire will ignite, and the flame will be a burnt yellow with a light green color, emitting a large amount of thick smoke. Heating on copper wire will result in a green flame. After shutdown, it is necessary to clean with a mild alkaline solution (such as sodium nitrate) before spraying anti rust oil. The machine barrel should be cleaned with PMMA, PP, LDPE, and EPPS.

fourth,The adhesive temperature should be between 185-205 ℃. It should not stay at 200 ℃ for 5 minutes, and at 210 ℃, it should not stay at 210 ℃ for 3 minutes.

fifth,Temperature setting: Rear: 140~160 ℃, Middle: 160~180 ℃, Middle: 170~190 ℃, Front: 170~190 ℃, Nozzle: 190~215 ℃, Mold: 30~60 ℃.

sixth,Use slow injection or multi-stage injection, and the pressure should not be too high. Suggest using a large water outlet

seventh,Screw speed matching cycle: The lower the back pressure, the better. (Available: PMMA, PP, LDPE, GPPS cleaning machine).

PMMA (acrylic or organic glass)

first,Shrinkage rate of 0.4%~0.7%, easy to burn in the presence of fire, with flames close to smokeless. After the fire is extinguished, smoke will be emitted, with a blue and yellowish flame that emits a sweet fruit flavor with a slight amount of smoke. The flame will still burn after the ignition is removed, and there is no need to use other materials for cleaning when the machine is stopped.

second,After 24 hours at room temperature, absorb 0.3% water. If necessary, bake at 75 ℃ for 2-4 hours. Dry the raw beer plastic for 2 hours, and bake for 3 hours when adding water or in humid weather from February to May.

third,The mold temperature should be 60 ℃, the nozzle should be ≥ 5mm, and the melt adhesive temperature should be 210 ℃~270 ℃. If the temperature is 260 ℃, the residence time of the material should not exceed 8 minutes.

fourth,Temperature setting: Later: 150-210 ℃

Middle: 170~230 ℃

Middle: 180~250 ℃, front: 180~275 ℃

Mouth: 180-275 ℃, mold: 60-90 ℃.

fifth,Slow injection molding can be used (to avoid high internal stress, multi-stage injection molding or gradual speed is recommended, and slow speed is recommended for thick products).

sixth,Screw speed matching cycle: The lower the back pressure, the better.

ABS (often referred to as ultra unbreakable adhesive)

first,The shrinkage rate is 0.4%~0.8%, and after adding 20% GF glass fiber, it becomes 0.2%~0.4%.

second,The base color is ivory or white, and the hot melt viscosity steadily decreases with increasing temperature, with a melting point of 175 ℃.

third,When burned, it produces a yellow flame with black smoke, emitting a strong alkaline smell similar to rubber. It is generally flammable and cannot be automatically extinguished.

fourth,Absorb 0.2-0.35% water within 24 hours at room temperature, and if necessary, bake at 80 ℃ for 2-4 hours. Dry the raw beer plastic for 2 hours, and bake for 4 hours when adding water or in humid weather from February to May. (Note: The first in, first out management system for goods must be strictly followed.)

fifth,The best mold temperature is 60 ℃, and hot runner molds are not suitable for fire-resistant ABS.

sixth,Use slow glue return as much as possible, and the low-temperature barrel should have low back pressure.

seventh,Impact resistance level: requires 220-260 ℃, with 250 ℃ being preferred.

Electroplating grade: requires 250-275 ℃, with 275 ℃ being preferred.

Heat resistance level: 240-280 ℃ is required, with 265-270 ℃ being preferred.

Fire rating: requires 200-240 ℃, with a preferred range of 220-225 ℃.

Transparency level: requires 230~260 ℃, with 245 ℃ being preferred.

Glass fiber grade: requires 230-270 ℃, mold temperature is 60-95 ℃.

eighth,At 265 ℃, the barrel should not stay for more than 5-6 minutes, and at 280 ℃, it should not stay for more than 2-3 minutes.

ninth,ABS material stays in the barrel for too long, and overheating of the barrel can cause ABS products to protrude without any problems. However, it may produce brown or brown stripes during the storage period, and differences in residence time or irregular cycles can cause discoloration of the products during storage.

tenth,Shooting speed: Slow speed (no decomposition) is used for fire resistance level, and fast speed (reducing internal stress) is used for heat resistance level. To produce the best product with high gloss, high-speed multi-stage injection molding speed should be used, the material should be dry, and the melt adhesive and mold temperature should be high.

eleventh,Screw speed: It is best to use a slow speed (matching cycle) and low back pressure.

twelfth,The properties of ABS material can still remain unchanged at 40-100 ℃, with a thermal change temperature of 100 ℃.

POM (commonly known as Sai Steel)

first,Material properties: Even at 50 ℃, its impact resistance remains good. POM-H has the maximum impact shrinkage strength, flexural strength, fatigue resistance, and hardness, while POM-K has good thermal stability, alkali resistance, and hot water resistance. Both belong to crystals with low water absorption. Shrinkage rate is 2

second,POM is a highly crystalline material (about 80 ℃) with a high degree of shrinkage. Within 48 hours, there will be a post plastic shrinkage of 0.1%. High mold temperature will increase the actual shrinkage of the parts, but reduce post plastic shrinkage (precision products require high mold temperature to produce stable products).

third,POM burns in a light blue color, with droplets of adhesive and minimal residual material and smoke. After extinguishing, it emits a strong formaldehyde odor. The melting point of POM-H is 175 ℃, and that of POM-K is 164 ℃.

fourth,POM baked material at 85 ℃ for 2-3 hours. POM-H/POM-K can be used at 215 ℃ (190-230 ℃) and must not exceed 240 ℃. Dry the raw beer plastic for 2 hours, and bake it for 3 hours when adding water or when the weather is humid from February to May.

fifth,If the equipment is of good quality (without adhesive blockage points), POM-H can stay at 215 ℃ for 35 minutes, and POM-K can stay at 205 ℃ for 20 minutes without decomposition. Be careful when cleaning, put the waste into cold water, and at the molding temperature, the adhesive cannot stay in the barrel for more than 20 minutes. POM-K can stay at 240 ℃ for 7 minutes or 210 ℃ for 20 minutes.

sixth,Temperature setting: rear: 165~210 ℃, middle: 162~200 ℃, middle: 170~210 ℃, front: 180~215 ℃ for combustion, nozzle: 170~215 ℃, mold: 40~120 ℃.

seventh,Shooting speed: (filling speed) Medium to fast, too slow can cause peeling, and too fast can damage the sprue.

eighth,Screw speed matching cycle: The lower the back pressure, the better. It is best to clean the machine with polyolefin (POLYDEFIN), and it cannot share the same barrel with PVC or fire-resistant grade. Even if it is used, it must be thoroughly cleaned, otherwise an explosion may occur.

Nylon 6 (NYLON6): abbreviated as PA6

first,When burning, the flame is blue with yellow edges, emitting white smoke, easy to extinguish, and has a burning smell of hair or cow horns.

second,The melting point of PA6 is 220 ℃, while that of PA66 is 265 ℃. After baking at 80 ℃ for 2-4 hours, PA6 absorbs more moisture than PA66 in the same environment, at 2.5% and 1.5%, respectively. Dry the raw beer plastic for 2 hours, or bake it for 3 hours in humid weather from February to May if water is added.

third,The mold temperature is 40-80 ℃, the glue temperature is 250 ℃, and the reinforcement level requires 270-280 ℃.

fourth,Temperature setting (not enhanced): Rear: 220~240 ℃, Medium: 230~250 ℃, Medium: 230~260 ℃, Front: 230~270 ℃, Nozzle: 220~260 ℃, Mold: 60~90 ℃.

fifth,The residence time of the material in the barrel should not exceed 20 minutes at 300 ℃, and the temperature can be lowered to 200 ℃ if necessary.

sixth,The faster the injection speed, the better (filling speed). To make the surface of the reinforcement level smooth but dull, slow injection is necessary. High speed injection can make the surface smooth but there may be bubbles.

seventh,Screw speed: It can be adjusted according to the cycle, and the fire resistance level should not be too fast. The lower the back pressure, the better. HDPE or PP can be used to clean the washing machine.

PA66 (Nylon)

first,PA66 water absorption: For every 1% increase in water absorption volume by 0.003 minutes, at a relative humidity of 50% and a temperature of 23 ℃, the water absorption is 2.5%.

second,PA66 has a melting point of 265 ℃. When burned, it melts, turns dark, and boils. The flame is blue with yellow, emitting white smoke that is easy to extinguish and emits a celery aroma.

third,Drying material: It can be dried at 85 ℃ for 2-4 hours using a vacuum hot air stove. Dry the raw beer plastic for 2 hours, and bake it for 4 hours when adding water or in humid weather from February to May.

fourth,The mold temperature should be 40-90 ℃, the melt adhesive temperature should be 260-290 ℃, preferably 280 ℃, and the lubrication and fire resistance levels should be at low temperatures, such as 260-275 ℃.

fifth,Temperature setting: unenhanced level: rear: 275~280 ℃

Medium: 270~285 ℃

Front: 265~285 ℃

Mouth: 260~280 ℃

Model: 20~100 ℃

Enhanced level: Post: 280~290 ℃

Medium: 285~290 ℃, Medium: 275~300 ℃

Front: 275~290 ℃, nozzle: 270~280 ℃

Mold: 55~95 ℃

sixth,Barrel dwell time: If the melt adhesive temperature is 300 ℃, it cannot exceed 15 minutes, otherwise it will degrade and the product will fade and be fragile.

seventh,Shooting rate: Fiber filling grade and thin adhesive products require rapid injection of adhesive.

eighth,Screw speed: slow or moderate, fiber filling should be slow, and the lower the back pressure, the better.

PA11, PA12 (Nylon 11/Nylon 12)

first,Both are linear semiconductor thermoplastic plastics with properties between PA6 and PE.

second,The shrinkage varies from 0.5% to 2%, depending on the grade, product thickness, and processing conditions. The shrinkage does not increase with the increase of mold temperature.

third,PA11 and PA12 both sink in water, all nylon materials sink in water, and PE floats in water. Observe the melting point of each nylon by distinguishing them.

fourth,Baking material: 85 ℃/3-5 hours, melt adhesive temperature 240-300 ℃, preferably 260 ℃, standard grade not exceeding 310 ℃, fire resistance grade not exceeding 270 ℃. Dry the raw beer plastic for 3 hours, and bake for 5 hours from February to May when adding water-based ingredients or when the weather is humid.

fifth,Temperature setting: unenhanced level: rear: 210~240 ℃