Specimen Preparation for Plastics

Good testing starts with a good specimen.

Standard thermoplastics and thermoset molding specimen are produced by injection or compression molding. Material characteristics are significantly influenced by production parameters such as pressure, temperature, and flow speed. Specimen are taken from slabs and components through mechanical processing such as per ISO 2818. 

Testing solutions for the plastics industry

Manual notching plane

Advantages and features

Specimen preparation_manual notching plane

  • convenient operation
  • low operating-force
  • interchangeable specimen magazines
  • stops automatically on attaining remaining width
  • easy to clean
  • linking of advance and plane motion ensures reproducibility, even with different operators
  • single and double notching

Range of application and function description

  • The notch cutting plane is designed solely for cutting notches in plastic specimens in compliance with the following standards:
  • ASTM D 256
  • ASTM D 6110
  • EN ISO 179
  • EN ISO 180
  • EN ISO 8256
  • BS 4713:2002

Technical data

Item No.

077097[1]

Standards

ISO 179, ISO 180, ISO 8256, ASTM D256, ASTM D6110 and BS 7413:2002

Dimensions:

Height

225

mm

Width

220

mm

Depth

397

mm

Weight, approx.

12.4

kg

Scope of delivery

Manual notch cutting plane, 1 x blade (notch shape A, radius 0.25 mm)

  1. Requires: 1 x specimen magazine

1:16

Manual notching plane

Manual notching plane for notching plastic specimens to Charpy or Izod

Cutting press

Manual eccentric lever

Specimen preparation_Zwick 7101 manual cutting press

Manual Cutting Press with Eccentric Lever

The Zwick 7101 manual cutting press is operated via an eccentric lever and is designed to hold up to four cutting devices simultaneously. It is also suitable for producing rectangular specimens up to 160 x 30 mm, together with 75 x 75 mm square specimens (option).

Manual with bent-lever

Specimen preparation_ Zwick ZCP 020 manual cutting press

Manual Cutting Press with Bent Lever

The ZCP 020 manual cutting press employs the bent lever principle. Attractive detail solutions allow accurate, convenient, energy-saving operation. The bent lever length was selected to achieve up to 30 % higher cutting force in the starting range than with conventional presses.

This cutting press features particularly operator-friendly design and can be placed on any workbench or laboratory table or mounted at optimum height on a suitably sturdy wall.

In addition, particular emphasis has been placed on simple, quick, and exact height adjustment of the compression die to accommodate the varying heights of different cutting blades.

Pneumatic

Specimen preparation_Zwick 7108 pneumatic cutting press

Pneumatic Cutting Press

The Zwick 7108 pneumatic cutting press enables higher cutting forces. The standard specification includes two-handed operation, with a safety interlock and retainers for the cutting blades.

Key advantages and features of the cutting press

Advantages and features

  • Standard-compliant specimen production
  • Manual or pneumatic operation, depending of type of press
  • Flexible—can be used for various materials with hardness up to 85 Shore A
  • Ease of operation
  • Integrated ejector system for extremely safe operation
  • Long tool service-life

Applications

Zwick cutting presses are used to produce specimens from rubber, elastomers and flexible foams with hardness up to 85 Shore A (as per ISO 868), as well as from plastic films and paper.

  • The specimen shapes involved are basically as follows:
  • rectangular specimens
  • dumbbell specimens
  • round specimens
  • special specimens

The exponential force curve at end of stroke makes bent-lever cutting-presses the ideal tool for operations only requiring full power at the end of the stroke.

Exceeding the stated Shore hardness will significantly reduce the service life of the cutter blade; in extreme cases damage may result.

Function description

A cutting press consists of a blade, a holder and an ejector. The blade is made of special steel and is supplied in one piece. This ensures optimum dimensional accuracy and stability plus a long service life.

The mechanical ejector is incorporated into the blade and can be adjusted to the target specimen thickness. On completion of the cutting operation the finished specimens are ejected. This minimizes the risk of injury to the operator and damage to the blade.

If the blades lose their sharpness they can be re-sharpened at Zwick's factory.

Technical data, cutting press

Type

Eccentric cutting press 7101

ZCP 020

7108

Item no.

071446

Compression force[1]

5

20

35

kN

Distance between table and die, max.

-

105 to 155

93

Throat

60

125

110

mm

Support-table dimensions

120 x 200

250 x 250

350 x 215

mm

Compressed air connection

-

-

6

Dimensions:

Depth

330

540...755

450

mm

Width

330

250

350

mm

Height

450

350

650

mm

Weight, approx.

50

kg

  1. at 1 mm die stroke

Automatic Notch Cutting

Specimen preparation_notching plane

Advantages and features

  • Stepless adjustment of cutting speed and feed rate
  • Operator-friendly display for rapid setting of new parameters
  • Manual notch-depth setting via fine-pitch screw-adjuster
  • Plexiglass safety hood
  • Quick-action gripping device allows specimens to be clamped quickly and easily
  • Single-tooth polycrystalline diamond milling cutter for optimum notch production
  • Connection for external compressed air supply for specimen cooling
  • Optional: Digital measuring instrument for checking notch depth

Applications

The Zwick ZNO 2010 notch-cutting machine is used for notching plastics specimens to ASTM D256, ASTM D6110, EN ISO 179, EN ISO 180 and EN ISO 8256 (Charpy and Izod tests).

Studies have shown that the dimensioning of the notch and the accuracy of its positioning have an effect on the measured energy. Close attention should therefore be paid to the accuracy of the notching.

Sturdy construction combined with safe, simple and reliable operation make the Zwick notch-cutting machine the ideal tool for producing notched specimens from all types of plastic.

Function description

A milling cutter is used to produce a V-shaped notch on one side of the specimen. Key aspects are the radius and remaining specimen width in the notch base.

The specimen are clamped together in a bundle, then notched in one operation.

A measuring device is optionally available for checking notch depth.

The entire notching operation is carried out in accordance with the relevant CE regulations.

Various cutters are available for different materials and notch radii, and are easy to change.

Technical data

Type

ZNO 2010

Item No.

035841

Tool:

Diameter

63

mm

Feed speed

70 to 500

mm/min

Feed:

Feed length

80

mm

Rotational speed

200 to 1000

r.p.m

Compressed air connection (cooling), max.

8

bar

Power specifications

230 / 50/60 / 2.5

V/Hz/kVA

Dimensions (H x W x D)

430 x 640 x 440

mm

Weight, approx.

45

kg

0:55

Zwick ZNO notch cutter

The Zwick ZNO 2010 notch-cutting machine is used for notching plastics specimens to ASTM D256, ASTM D6110, EN ISO 179, EN ISO 180 and EN ISO 8256 (Charpy and Izod tests).

Strip cutter for plastic film

Specimen preparation_strip cutter for plastic film
Specimen preparation_strip cutter for plastic film

Applications

The Zwick film strip cutter cuts up to 10 parallel specimen strips from approximately DIN A 4 size films in one operation. The strips are used for standard-compliant tensile strength tests on films.

Function description

The Zwick plastic-film strip cutter is simple and convenient to operate.

The adjustable double-cutting blade holder enables operation both towards and away from the operator.

The film for cutting is drawn (wrinkle-free) over the curved clamping surface and fixed in the clamping slots at the front and rear of the device by means of gummed strip. The cutting operation is performed by simply moving the handle on the pivoted frame in the desired direction.

Depending on the initial width of the film, a maximum of 10 strips are cut in one pass.

The blade is mounted in the pivoted frame in such a way as to ensure safe operation of the strip cutter, with no risk of injury.

Technical data

Type

Strip cutter for plastic film

Strip cutter for plastic film

Strip cutter for plastic film

Item No.

377850

022316

377851

Device dimensions

Length

420

420

420

mm

Width

290

290

290

mm

Height

340

340

340

mm

Test area

Length

600

600

600

mm

Width

350

350

350

mm

Height

500

500

500

mm

Strip length, approx.

230

230

230

mm

Strip width

10

12.7

15

mm

Type of cut

double-sided

double-sided

double-sided

Film thickness (material-related)

0.002 to 0.9

0.002 to 0.9

0.002 to 0.9

mm

Finish

RAL 7035 gray

RAL 7035 gray

RAL 7035 gray

Ambient temperature

+ 16 to + 35

+ 16 to + 35

+ 16 to + 35

°C

Humidity

20% to 60% (non-condensing)

20% to 60% (non-condensing)

20% to 60% (non-condensing)

Approx. weight

29

29

29

kg

Automatic Specimen Preparation System

A 10kN materials testing machine with motorized X-Y table is used with the automatic specimen-blanking machine. The operator is protected by a safety device around the blanking tool and the moving crosshead. Specimen sheets are placed on the motor-driven X-Y table and secured with quick-acting clamps. The system is started and specimens are punched out of the sheets in different positions according to the test program or blanking program. The blanking tool itself is fitted with an automatic cup extractor. The specimen shape depends on the blanking tool installed. Various blanking tools can be used, entirely according to your requirements. The blanking tool is changed manually.
roboTestX_specimen blanking_all_+FO
roboTest X_specimen blanking_working area_+FO

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