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Plastic housing > Plastic housing > PBT white housing > PBT Plastic Housing T204
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PBT Plastic Housing T204
Goods ID:130000384
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Product parameters

Goods ID: 130000384 Brand: TARSO
Category: PBT white housing Weight:(g) 120.00
Bearing seat model: PBT塑料轴承座 T204 Color: white
Bearing seat type: Take-up Housing T Operating characteristic:
I.D. for Inset Bearing with Housing:(mm) Spherical Diameter:(mm) 47
Bearing seat molding method : Casting Plastic Bearing seat material: PBT
Supporting bearing UC204    

Product Feature

Plastic seat with light weight, easy to install, maintenance-free properties, while cushioning the impact resistance with commonly used cast iron seat or do not have the punch holder


Bearings supporting plastic seat

Product Details


Plastic housing Product Description

Plastic seat with unique light weight, easy to install, maintenance-free , but with a common cast iron seat or seats that are not stamped with a damping impact resistance. With the continuous development of new materials , plastic seat being increasingly widely used in engineering . For different situations , plastic spherical bearing can be POM, HDPE, PP, UPE, PTFE and other different materials, commonly used PBT plastic housing material .

PBT Introduction

Poly (butylene terephthalate) , the English name polybutylece terephthalate ( referred to as PBT), a polyester series , is a 1.4 - butanediol (1.4-Butylene glycol) and terephthalic acid (PTA) or dimethyl terephthalate ester (DMT) poly condensation, and made ​​through the mixing process is translucent to opaque white , crystalline thermoplastic polyester resin. Collectively together with PET thermoplastic polyester , or polyester.

The advantages of this material : a toughness good , not broken .

                    Note 2 streams good performance , easy molding .

                   3 relatively inexpensive phenolic material

The disadvantage of this material : no heat , when the temperature deformation

PBT physicochemical properties

PBT is translucent to opaque white , crystalline thermoplastic polyester. With high heat resistance, toughness , fatigue resistance , self-lubricating , low friction coefficient , weather resistance , low water absorption , only 0.1 % in wet conditions remain variety of physical properties ( including electrical properties ) , electrical insulation, but volume resistivity and dielectric loss big . Heat water, alkalis, acids, oils , halogenated hydrocarbons but are vulnerable to erosion , poor water resistance , low temperature can be rapidly crystallized, forming good . The disadvantage is that the notched impact strength low mold shrinkage . Therefore, most of the glass fiber reinforced or modified inorganic filler , the tensile strength, flexural strength can be increased more than doubled, heat distortion temperature also greatly improved. You can work long at 140 ℃, glass fiber reinforced products after longitudinal and transverse shrinkage consistent , easy to make products warpage.

PBT Process

PBT thermoplastic polyester plastics can be called , is applicable to different processing industries , the general number of additives are added or blended with other plastics , as additives in different proportions , can produce different specifications. PBT has the heat resistance, weather resistance, chemical resistance , good electrical properties , low water absorption , good luster, widely used in electronic appliances, auto parts, machinery , household goods , etc., and PBT products and with PPE, PC, POM, PA and so were called the five pan with plastic .

PBT crystallization speed , the most suitable processing method for injection molding, as well as other methods of extrusion, blow molding, coating and various secondary processing molding , molding required before pre-drying , moisture content should be reduced to 0.02 %.

PBT injection molding process characteristics and process parameters can be set :

PBT polymerization process maturity, low cost, easy molding. Unmodified PBT poor performance , the practical application of PBT to be modified , in which glass fiber reinforced modified grades accounted for more than 70% PBT 's .

1 PBT technology features of

PBT has a sharp melting point , melting point of 225 ~ 235 ℃, is a crystalline material , the degree of crystallinity of up to 40 %.

PBT melt viscosity is not as affected by temperature shear stress so much so , in injection molding , injection pressure PBT melt flow impact is obvious .

PBT fluidity in the molten state , low viscosity, second only to nylon molding prone to " cast " phenomenon.

PBT molding products anisotropy. PBT at high water readily biodegradable .

2 injection molding machine

Selection of the screw -type injection molding machine. Should consider the following points .

①products should be controlled by feeding 30% to 80% of the injection molding machine rated maximum amount . Not with a large injection molding machine to produce small products.

②should use tapered screw three sections , the aspect ratio of 15 to 20 , the compression ratio of 2.5 to 3.0.

③should use self-locking nozzle and heating temperature control device .

④When the forming flame retardant PBT, injection molding machine related parts should embalmed .

3 product and mold design

①thickness of the article should not be too thick , PBT is very sensitive to the gap , so the transition at right angles and other products should be used to connect the arc .

②unmodified PBT molding shrinkage rate of the larger , 1.7 % ~ 2.3% , have a certain mold stripping slope .

③mold needs to vent or exhaust ducts located .

④gate diameter should be larger.

⑤mold temperature control device to be set . High mold temperatures can exceed 100 ℃.

⑥Flame Retardant PBT molding, the mold surface to chrome to corrosion .

4 raw material preparation

Dried prior to injection , to control the moisture content below 0.02%. When using hot air drying cycle , when the temperature is 105 ℃, 120 ℃or 140 ℃, the time corresponding to no more than 6h, 4h, 2h. Material thickness less than 30mm.

Five injection molding process parameters

①PBT injection temperature decomposition temperature of 280 ℃, and actual production is generally controlled between 235 ~ 245 ℃.

②injection pressure, injection pressure is generally 50 ~ 100MPa.

③injection rate PBT cooling speed , and therefore faster injection rate.

④screw speed and back pressure molding PBT screw speed should not exceed 80r/min, generally between 25 ~ 60r/min. Back pressure is generally 10% to 15% of the injection pressure .

⑤mold temperature control in 70 ~ 80 ℃, the temperature of each part of the difference does not exceed 10 ℃.

⑥molding cycle under normal circumstances is 15 ~ 60 s.

6 Precautions

①the use of recycled material and new material proportion of recycled materials is generally 25% to 75%.

②use of the releasing agent is not used under normal circumstances the release agent, silicone release agent may be used when necessary .

③stop processing PBT downtime in less than 30min, can be shut down when the temperature drops to 200 ℃. After a long shutdown of production , the material inside the barrel emptying want , then add new material to normal production .

④products after processing generally does not require treatment , if necessary, treatment 1 ~ 2h at 120 ℃, .