MARFRAN 2K TPE COMPOUNDS FOR 2K TECHNOLOGIES

PEELING TEST ACCORDINGTO VDI 2019 As part of the test, the soft component of the specimen is subjected to traction at a constant speed, at an interfac...

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MARFRAN 2K TPE COMPOUNDS FOR 2K TECHNOLOGIES

MARFRAN® 2K GRADES OVERVIEW Food contact Grade

PP

20 ÷ 95

YES

X

45 ÷ 95

YES

MARFRAN® E C2

40 ÷ 90

MARFRAN® E A2

(PS, SAN, ABS, ASA)

Polycarbonate and PC blends

YES

X

X

X

50 ÷ 90

NO

X

X

X

MARFRAN® E A2F

50 ÷ 85

YES

X

X

X

MARFRAN® E TPA1

40 ÷ 80

NO

X

MARFRAN® E TPA3

55 ÷ 75

YES

X

MARFRAN.MED® ST, M, HTR

30 ÷ 90

USP VI

MARFRAN.MED® A1

50 ÷ 70

USP VI

GRADE MARFRAN® standard families MARFRAN® EHA

Hardness ShA

PE

Styrenics

(i.e. PC/ABS)

PBT TPE-E

PA6 PA66

X

X X

X

X

PROCESSING SUGGESTIONS Pre-drying is MANDATORY for materials intended for adhesion to polymers which themselves must be pre-dried: the material must be dried for 4 hours at 80°C before processing. INJECTION MOULDING Adhesion on Temperature profile of the barrel (°C) Maximum allowed processing temperature (°C) Mould temperature (°C)

• •

• • • •

PP and PE

Styrenics and PC

PA6 and PA66

190 ÷ 220

200 ÷ 260

220 ÷ 260

240

270

270

20 ÷ 30

30 ÷ 60

30 ÷ 60

Injection moulding machine with standard general purposes three zone screw for polyolefinic polymers Best result will be achieved using a two-shot injection moulding machine with rotating tool; insert moulding is anyway possible but it does not provide the same results as a two-shot process Hot runners must be preferred over traditional sprues Injection pressure/speed: medium/high Rigid substrate pre-heating: strongly recommended to allow the best adhesion Screw feeding delay recommended 2

EXTRUSION Adhesion on PP and PE

Adhesion on Styrenics and PC

Temperature profile of the barrel (°C)

170 ÷ 200

180 ÷ 220

Die temperature (°C)

180 ÷ 210

200 ÷ 230

240

260

Maximum allowed processing temperature (°C)

• • •

Single screw extruder with standard three zones screw for polyolefinic polymers L/D ratio ≥ 25 Screw compression ratio ≥ 2,5:1

MOULD DESIGN TIPS Given that the responsibility for the correct functioning of the mold is the sole responsibility of the designer, here below are some general suggestions that can be taken into consideration during the mold design phase. Francesco Franceschetti Elastomers does not accept responsibility for the molds and / or the products made by converters. DESIGN THE CONTACT SURFACE Beyond the transformation conditions of the TPE that of the rigid substrate, the quality of the adhesion depends on the geometry of the contact area between the two materials. Criteria of the project: Maximize the contact area itself Create, if possible, holes, grooves and/or undercuts in order to maximize the bonding between the two materials Avoid thickness thinning areas of the TPE Here are some examples of layouts to avoid compared to other recommended ones. Layout to avoid

Better layouts

Limited contact area; thickness thinning areas in the second example

High contact surface; no thinning area 3

Layout for larger surfaces and reduced thicknesses

High contact surface with many mechanical couplings

TOOL VENTS DESIGN Particular attention should be paid to the positioning and sizing of the tool vents. Incorrect design of the vents can lead to filling difficulties, material burns, unsatisfactory surface finish, loss of adhesion between the materials in the final parts of the filling.

PEELING TEST ACCORDING TO VDI 2019 To evaluate the degree of adhesion between two different materials, Francesco Franceschetti Elastomeri follows the VDI 2019 standard. This procedure involves the molding of a specimen on a bi-injection machine, the specimen is then tractionated to perform the peeling strength measurements. This procedure allows us to provide the customer with scientific data on which to base serious and reliable projects.

SPECIMEN

PEEL TEST

As part of the test, the soft component of the specimen is subjected to traction at a constant speed, at an interface angle of 90° until the joint between the two materials separates or the softer material breaks. The required force and distance traveled are processed by a dedicated machine set according to ISO 527-1. 4

SOME RESULTS ON OUR MATERIALS PC

Grade

MARFRAN® E C2 PEEL TEST according to VDI 2019 ABS

PBT

Peel T Peel T Peel T detachme detachme detachme Strength injection Strength injection Strength injection nt mode nt mode nt mode (N/mm) TPE (°C) (N/mm) TPE (°C) (N/mm) TPE (°C)

MARFRAN® E C2 40A 3,5÷4,0

B

200÷220

MARFRAN® E C2 70A 6,0÷7,0

D

200÷220 3,5÷4,0

B

210÷230 4,5÷5,0

MARFRAN® E C2 80A 9,0÷10,0

D

200÷220 5,0÷6,0

B

210÷230

MARFRAN® E C2 90A 9,5÷10,5

D

200÷220 5,0÷6,0

B

210÷230

Grade MARFRAN® E TPA1 65A

D

240

MARFRAN® E TPA1 and MARFRAN® E TPA3 PEEL TEST according to VDI 2019 PA66 (nucleated) PA66 (with release agent) Peel Peel detachment T injection detachment T injection Strength Strength mode TPE (°C) mode TPE (°C) (N/mm) (N/mm) 4,8

C

220

5,2

C

220

MARFRAN® E TPA3 55A

5,9

D

220

5

D

220

MARFRAN® E TPA3 75A

5,6

D

220

5,6

D

220

Detachment mode description NO TPE residue on substrate 1% to 50% TPE residue on substrate, NO TPE break 51% to 99% TPE residue on substrate, NO TPE break TPE strip tears within 15mm of peeling path

Mode A B C D

The data provided in this documentation are based on laboratory test and on the best knowledge of the company at the revision date. Technical data may be modified based on new tests and / or knowledge available. All the information has provided to give a technical description of the product. Francesco Franceschetti Elastomeri doesn’t assume liability about the use of such information and doesn’t give warranties about the final goods made by the customer. 5

FRANCESCO FRANCESCHETTI ELASTOMERI via G.Pastore 33/35 25040 Corte Franca (BS) - ITALY tel. 030 9860511 www.f-franceschetti.it www.tpe.it [email protected]