JP3506498B2 - Winding hardness measurement method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a winding hardness of an object wound on a core such as an adhesive tape, a magnetic tape, a film ink ribbon and the like. 2. Description of the Related Art Generally, a commercially available pressure-sensitive adhesive tape or the like is prepared by coating a wide and long material with a pressure-sensitive adhesive.
It is cut in the width direction and wound up in a small length around a cylindrical core in a short length, or in the reverse order. [0003] When a small tension is applied to wind these wound materials into a small winding, a gap is formed or a core falls off. On the other hand, if it is large, it becomes frustoconical with time,
The coating material protrudes from the cut surface or is transferred to the back surface, causing various problems. While the tension is controlled by various methods at the time of winding into a small winding, the measurement of the tension in a state where the winding is small, that is, the measurement of the winding hardness is perpendicular to the cut surface. The only way to do this was to apply force in the direction and measure the difficulty of the truncated cone by finger touch. SUMMARY OF THE INVENTION [0005] The present invention is a method for measuring the hardness of a winding by a numerical value without measuring it with a finger. The present inventor has found that it is possible to measure the winding hardness by changing the outer diameter by applying a pressure in the outer diameter direction of the wound material. Next, an embodiment will be described with reference to the schematic diagram of FIG. A stopper 4 for mounting the roll 3 is fixed to the lower part of the vertical shaft 2 of the pedestal 1 which is substantially vertical. A pressure plate 5 movable along the vertical axis 2 is provided above the stopper 4 so as to be able to be pressed downward by a cylinder 6. A laser displacement sensor 7 is fixed on the vertical axis 2 above the pressure plate 5 at a position at a fixed distance from the stopper 4 so as to be able to measure downward on the pedestal 1. The pressure plate 5 is provided with a small hole 8 on the vertical axis 2 so that light passes therethrough. The method for measuring the winding hardness is as follows.
Is placed on the stopper 4 vertically in the outer diameter direction. Sensor 7
Then, the distance to the roll 3 is measured through the small hole 8 of the pressure plate 5, and then the cylinder 6 presses the pressure plate 5 to the roll 3 at a constant pressure. The distance after a certain period of time is similarly measured through the small hole 8 of the pressure plate 5, and the rate of change of the outer diameter of the wound material 3 is calculated from the difference from when no pressure is applied. If the rate of change is large, the roll is soft, and if small, the roll is hard. Numerical management has become possible. As described above, the present invention is a method which can easily measure the hardness of a roll.

[Brief description of the drawings] FIG. 1 is a schematic view of one embodiment of a method for measuring winding hardness according to the present invention. [Explanation of symbols] 1 pedestal 2 Vertical axis 3 reels 4 Stopper 5 Pressure plate 6 cylinders 7 Laser displacement sensor 8 small holes

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01B 11/16 G01B 11/08 G01N 3/42 G01N 21/88

Claims (1)

(57) [Claims] [Claim 1] A stopper generally above the vertical axis above the lower axis, the radial direction being on the vertical axis, and a roll in contact with the stopper, a transparent movable in the vertical axis direction, or A pressure plate having a small hole on the vertical axis and a laser displacement sensor fixed at a fixed distance from the stopper are provided downward, and a constant pressure is applied to the retentate between the stopper and the pressure plate by the pressure plate. A winding hardness measuring method for measuring the winding hardness of a wound material by measuring a difference in a distance to the wound material after a certain period of time during pressurization.