A TECHNO-ECONOMIC NEWS MAGAZINE FOR MEDICAL PLASTICS AND PHARMACEUTICAL INDUSTRY
Our 11th Year of Publication
Page 4 of 6

Seminar Report

Medical Plastics : Materials, Applications And Processing

For Medical Devices And Pharmaceuticals Industries

SUCCESSFUL INJECTION MOLDING FOR MEDICAL COMPONENTS

Avenues for cycle time reduction

  • Don't use oversized machine, all machine times should be shortest

  • Melt should afford shortest cooling - depends on homogeneity of melt and at least orientation in molecules (influenced by filling process)

  • Plastics within cooling time, or, should run parallel to mould open close.

  • Ejector, Core, Carriage movement to run during essential time segments of cycle - Mould Open-Close-Inject-Cool

Polypropylene Processing guideline for PP..........

 

Nozzle

Front

Center

Rear

Barrel Temperature Deg. C

220-300

220-300

220-300

160-250

Recommended temp

240

240

220

200

 

Rec. Melt temp    : 245-260 for low flow lengths

                            245-260 for low flow lengths

Rec. Mould temp. : 50 (range 30-50)

Injection                        Moderate

Injection Pressure          800-1400 bar

 

Pack / Hold

 

Long hold on time required to avoid sink marks pressure @ 30 to 60 % of injection pressure

 

Back pressure              50-200 (melt)

Screw speed                up to 1.3 m/s

Shot weigh utilization    0.5 to 4.0 D

 

Notes :

The processing window is wider, so better opportunity for optimization

How to select an Appropriate PP type for a given application

 

PP Type

Propety

PPHP

PPRCP

PPICP

Stiffness

Flexural Modulus

HDT

Surface Hardness

­­­

­­

­

Toughness

Impact

Strength

­

­­

­­­

Clarity

­­

­­­

­

      ­Low            ­ Moderate ­ Maximum
 

 

Product Details

 

 

 

 

Material Details

 

 

1

Name

2 ml Syringe Barrel

 

 

1

Material

PP

 

 

2

Dimensions

 

 

 

2

Grade

R120 MK

 

3

Part Weight

1.5 Gms x 16 Cavities

3

Source

Reliance

 

4

Wall Thickness

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Machine Details

 

 

 

Mould Details

 

 

 

1

Model

Sigma 110

 

1

No of cavities

16

 

 

2

Injection Frame

B40

 

2

Shot Wt.

40.69

 

 

3

Screw dia

45 mm

 

3

Dimensions

 

 

 

 

 

 

 

 

4

Type of ejection

Mechanical

 

 

Cycle Time

8.5 Sec

 

5

Gate type

Pin Point

 

 

 

 

 

 

 

6

Hot/Cold Runner

Cold

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
 

 

 

Product Details

 

 

 

 

Material Details

 

 

1

Name

2 ml Plunger

 

 

1

Material

HDPE

 

2

Dimensions

Dia 14/8.88 ;  8.5 mm ht

2

Grade

M 60200

 

3

Part Weight

1.0 gram

 

 

3

Source

Reliance

 

4

Wall Thickness

0.88 mm

 

 

 

 

 

 

 

 

 

 

 

 

 

Machine Details

 

 

 

Mould Details

 

 

 

1

Model

Sigma 80

 

1

No of cavities

24

 

 

2

Injection Frame

C 32

 

2

Shot Wt.

35 grams

 

 

3

Screw dia

42 mm

 

3

Dimensions

300 x 445 x 250

 

 

 

 

 

 

4

Type of ejection

 

 

 

 

Cycle Time

14.0 Sec

 

5

Gate type

 

 

 

 

 

 

 

 

6

Hot/Cold Runner

Cold Runner

 

 

 

 

 

 

 
 

 

Product Details

 

 

 

 

Material Details

 

 

1

Name

Niddle Cover

1

Material

Poly Propylene

 

 

2

Dimensions

Length 45 mm, Dia 9 mm

2

Grade

120

 

 

3

Part Weight

0.6 Grams

 

3

Source

Reliance

 

 

4

Wall Thickness

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Machine Details

 

 

 

Mould Details

 

 

 

1

Model

Sigma 110

 

 

1

No of cavities

72

2

Injection Frame

 

 

 

2

Shot Wt.

70 Grams

3

Screw dia

45 mm

 

 

3

Dimensions

350x250x250

 

 

 

 

 

 

 

4

Type of ejection

 

 

 

 

Cycle Time

16.5 Seconds

 

5

Gate type

Pin Point

 

 

 

 

 

 

 

6

Hot/Cold Runner

Hot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Product Details

 

 

 

 

Material Details

 

 

1

Name

Niddle Cover

1

Material

Poly Propylene

 

 

2

Dimensions

Length 16 mm, Dia 6 mm

2

Grade

110 NA

 

 

3

Part Weight

0.54 Grams

 

3

Source

Reliance

 

 

4

Wall Thickness

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Machine Details

 

 

 

Mould Details

 

 

 

1

Model

Sigma 50

 

 

1

No of cavities

16

2

Injection Frame

A 28

 

 

2

Shot Wt.

15.63 Grams

3

Screw dia

28 mm

 

 

3

Dimensions

 

 

 

 

 

 

 

 

4

Type of ejection

 

 

 

 

Cycle Time

14.0 Seconds

5

Gate type

Pin Point

 

 

 

KW/Kg/Hr.

 

 

 

6

Hot/Cold Runner

Cold

 

 

 

Cpk Value

 

 

 

 

 

 

 

 

 

 

 

 

 

 
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