Rubber Terminologies- B

B

Backrind : A molding defect in which the rubber adjacent to the parting line shrinks below the surface of the molded product, with the parting line often being ragged and torn.

파팅 라인에 인접한 고무가 성형 제품의 표면 아래로 수축하여 파팅 라인이 종종 깎여서 찢어지는 성형 결함.



Banbury mixer: A special type of internal mixer used to blend fillers and other ingredients with an elastomer.

충전재 및 기타 성분을 엘라스토머와 혼합하는 데 사용되는 특수 유형의 내부 혼합기.

Bank: the reservoir of material at the opening between rolls of a mill or calendar

Band:

(1) A strip of rubber from a previous batch left  running round the front roll of an open mill to

facilitate loading of the next batch.

(2) An assembly of plies of rubberised cord fabric used in ‘building’ or making; the casing of a pneumatic tyre

Batch: The product of one mixing operation.

Back-Up-Ring : (Anti extrusion device) A ring of relatively hard and tough material, placed in the gland between the O-Ring and groove side walls, to prevent extrusion of the O-Ring

.

Balata: The hard thermoplastic hydrocarbon obtained from the latex of Mimusops globosa. Balata has the same molecular formula as natural rubber ( but has the trans  polyisoprene structure whereas natural rubber has cis -structure.

Mimusops globosa의 라텍스에서 얻은 경질 열가소성 탄화수소. 발라 타 (Balata)는 천연 고무와 동일한 분자식을 가지고 있습니다 (그러나 트랜스 폴리 이소프렌 구조를 가지고있는 반면 천연 고무는 시스 구조를 가지고 있습니다

Ball Mill:A cylindrical container half to two-thirds filled with a grinding charge consisting of unglazed porcelain, glass balls, pebbles or flint gravel; it is used in the preparation of aqueous dispersions of ingredients for use in the manufacture of products direct from latex.

Ballotini:

A material used in fluid bed vulcanisation. It consists of very small spherical particles of glass

of a narrow size distribution, approximately 0.1 to 0.2 mm.

Barrel: That part of an extruder in which the screw rotates.

Barytes: Naturally occurring barium sulphate, BaSO4; it has the high specific gravity of approximately 4.45 and is used as a filler, especially when a high specific gravity rubber compound is desired  or is not a disadvantage. Is also used as an acid resistant white filler.

Bead  – The annular structure of wire, fabric and rubber compound as part of a tire that holds the tire to the rim of the wheel.

Bead to Bead Remoulding: A tyre retreading process in which new rubber is applied as tread, on the tyre shoulders and on the tyre sidewalls.

Bias:In the manufacture of pneumatic tyres and some types of hose, the angle at which the textile

material is cut with respect to the running edge of  the fabric.

Bias Tyres: Tyres made using ply cords which lie in a diagonal direction from bead to bead.

Biodeterioration :Deterioration of rubbers, fibres or plastics resulting from attack by living organisms

Blister: A raised spot in the surface or a separation between layers,usually forming void or air filled space in the vulcanizer article.

Bleeding: Migration to the surtureface of plasticizers,waxes or similar materials to form a film or bead.

Blemish : A mark, deformity or injury which impairs appearance

Bloom: A dusty or milky looking deposit that sometimes appear on the surface of a molded products after molding,caused by Migration of a liquid or solid to the surface.

Bladder:Another name for the inflatable diaphragm which takes the place of the curing bag in the automatic curing of pneumatic tyres in a diaphragm press.

Blank:A piece of uncured rubber compound of suitableshape and volume to fill the cavity of the mould in which it is to be vulcanised; also termed a ‘slug.

Blowing Agent  – A chemical added to a rubber compound to produce gas by chemical or thermal action in the manufacturing of hollow or sponge articles.

Bleaching Agent: A substance added to latex in the preparation of pale crepe rubber; sodium bisulphate prevents darkening of the crepe due to the presence of oxidising enzymes, xylyl mercaptan is an effective bleaching agent proper.

Blocking:The tendency of sheets of rubber to stick together, dusting and anti-tack agents are used to overcome this problem.

Bond: The mechanical or chemical force that holds an elastomer to some other object. Mechanical bonding includes component interference or a physical fixing and no molecular cross bridging between the elastomer and substrate, whereas chemical bonding involves contact or epoxy cold bond  adhesives or full vulcanization with heat and pressure to adhere an elastomer to a primed surface.

Boot – A bellows type covering to exclude dust, dirt, moisture, etc., from a flexible joint.

Brittle Point:When an elastomer sample is subjected to low temperatures, the brittle point is the highest temperature at which the sample breaks when subjected to a sharp blow. The brittle point is one indication of low temperature flexibility and is usually somewhat higher than the glass transition temperature

Brown Crepe:Crepe rubber of lower quality than pale crepe; it is made from the pre-coagulated lumps which form in the latex before the coagulation process is carried out.

Building Tack:

The term used to describe the ability of a rubber to stick to itself in the uncured state, so allowing pre building of the material before curing.

Bud Grafting:A means of reproducing high yielding or other desirable characteristics in the rubber tree; a bud taken from a seedling bred from a tree known to yield large quantities of good quality latex is grafted onto the stem of a young rubber plant.

Buffing:Worn tyres are prepared for retreading by a buffing/grinding process to provide a fresh rubber surface.

Bumping:In the moulding of rubber products, the operation of opening and closing the press rapidly in the early stages of the cure to drive out any trapped air.