德国KKO型塑料表面划痕试验仪 塑料表面划痕测试仪

备基本由平面，硬质刀片，加载弹簧组成。在平面的边缘有一弹簧加载测试刀片。弹簧上的力能够通过刻度逐步调整，满足塑料测试要求。在测试过程中，平面被以恒定的速度拖离。测试标准是划痕的可见性.

Scratch Tester for plastic surfaces - type KKO

Description of the tester

The device basically consists of a plane, a hardmetal blade and a loading spring. At the scarf edge of the plane there is a spring-loaded test blade. The force applied by the spring can be adjusted steplessly on a scale according to the plastic to be tested. 
During the test the plane is pulled over the surface at a uniform velocity. The test criteria is the visibility of scratches.
1. Manual
1.1.Preparation of the tester

Checking the adjustment of the blade
In position 9 the blade has to stick out by at least 3mm vertically to the contact area. In the rearmost position the blade has to be fully inside the the contact area body. In positin 9 the blade has to reach the front stop.
Adjusting the scale value required in 2.2.

1.2. Conducting a test

The tester is set on the horizontally placed. It is pushed over the surface on a preferably even spot in an equal and straight-lined move. 

Depending on the specimen’s dimensions preferably three test marks should be set parallel to each other for a testing distance of about 150 mm. Three more marks are to be set vertical to them. The test marks should have a distance of at least 10 mm to each other. 

2. Classification of the requirements 

The classification is done by the testing engineer or is determined in a component specific testing standard. 

2.1 Visible spots
A Direct spot with decoration function e.g. bars, emblems etc. 
B Direct spot, often in field of view. Close parts such as A column, cockpit etc. 
C Restricted field of view such as fond, entrance area, well visible parts in feet area, trunk, B column, pockets etc.
D Generally covert areas such as trunk, engine compartment etc. 

2.2 Loading
Scale division 	Corresponds to	Force	 
 		 		 	 
10	 	 	 	0 N	 
9,5		 		about 1 N	 
9	 	 	 	about 1,5 N	 
8,5		 		about 2 N	 
8	 	 	 	about 3 N	 
7,5		 		about 3,5 N	 
7	 	 	 	about 4,5 N	 
6,5		 		about 5 N	 
6	 	 	 	about 5,5 N	 
5,5		 		about 6,5 N	 
5	 	 	 	about 7 N	 
4,5		 		about 8,5 N	 
4	 	 	 	about 9,5 N	 
3,5		 		about 10 N	 
3	 	 	 	about 11 N	 
2,5	 	 	 	about 11,5 N