Basic knowledge of Rubber Rollers (7,8,9)

There are two methods of bonding core and rubber, one using an adhesive agent and the other using an ebonite.

※ Basically, adhesive agent method is used. Ebonite method is used when adhesive agent can be affected by the solvents used or when the condition of the core surface is not good.

･Groove cutting and Screw-thread cutting

Rubber rollers with various types of cutting are widely used in various fields.
The main purposes of cutting are;

(a)to increase the amount of coating
(b)o smooth out wrinkles in plastic films and papers.
(c)to prevent a belt slipping and meandering
(d)to emboss on plastics.
(e)to assist the heat release from rubber rollers.
(f)o apply softness of rubber rollers.
(g)to raise the coefficient of friction.
(h)to improve contact stability with papers or plastic films.

The standard shapes are shown in the diagram below.

Name	Cross-sectional view (Groove shape)	Applicable Groove pattern
Square Groove		Vertical, Horizontal, Double Helical Worm, Diamond, Screw-thread
Trapezoidal Groove		Vertical, Horizontal, Diamond, Screw-thread
V-Groove		Screw-thread
Double Saw Edge Groove		Double Helical
Half Circle Groove		Vertical, Screw-thread
Round Groove		Vertical, Horizontal, Screw-thread

D…Depth R…Radius F…Crest width W…Groove width P…Pitch

Name	Plane view (Groove pattern)	Purposes and Applications
Vertical Groove		(Single vertical groove) Purposes : (d), (e), (f), (g) Applications…Cardboard(Throw-in roller)   Ordering instruction: Required number of grooves
Horizontal groove		(Single horizontal groove) Purposes: (c), (d), (f), (g) Applications: Cardboard(Throw-in roller)   Ordering instructions: Required number of grooves
Helical groove		(Multi-spiral groove) Purposes: (c), (e) Applications: Belt sander for plywood, metal plate   Ordering instructions: Require number of grooves and an angle of the spiral.
Double helical groove		(iral dMulti-spivided at the center) Purposes: (b), (c), (e) Applications: Belt sander for plywood, metal plate   Ordering instructions: Require number of grooves and an angle of the spiral.
Worm groove		(Single line and multi-spiral groove) Purposes: (b), (c), (e) Applications : Worm rollers for paper manufacturing, dyeing, guide rollers   Ordering instructions : Require number of grooves and an angle of the spiral.
Diamond cut groove		(Going & returning multi spiral groove) Purposes: (c), (e), (h) Applications: Grip rollers for cardboard, cloths. Rollers for various kinds of film industry   Ordering instructions : Require number of grooves and an angle of the spiral.
Screw-thread groove		(Continuous thread grooves) Purposes: (a) Applications: Coating rollers for plywood, metal plate, cardboard   Ordering instructions: Number of ridges per inch, Direction of thread (right or left)

Inspection Item	Measuring method	Tolerance
Outer rubber diameter	Measure in 1 - 5 points with tooth thickness micro meter or π tape.	0 - 0.5mm or less
Cylindricity	ake the difference between the highest measured value and the lowest measured value of outer diameters.	In case Surface length is; a)3000mm or less, it is 0.05mm or less. b)more than 3000mm to L/D25 or less, it is 0.07mm or less.
Hardness	A Durometer A hardness meter is used	±3°
Roundness	Take the difference between two diameters. Both of diameters are on the same cross section and make right angle. (Difference of measurements between X and Y)	0.03mm or less
Static run-out	Maintain the rubber surface run-out precision by adjusting run-out precision at each bearing part (A, B) to 0.02mm or less.	0.05mm or less
Shape of crown Crown height   Outer diameter	The difference between the diameters of the central part and both edges is the crown height.       The central part is taken for outer diameter measurement.	Crown height In case 0.5 or less : ±0.05mm n case more than 0.5 : ±0.1mm   0 - 0.5mm
Surface length	Measure the length of the rubber with contacting a scale or a gauge parallel to the surface of the roller. The smallest value is taken.	Surface length 2000mm or less : ±1mm more than 2000mm : ±2mm

* These values are shipping standard values for Katsura's general rubber rollers.
Rollers consist of sponge, cleaner material, soft rubber, soft polyurethane are exception.
If you need higher precision, consult our representative.