Types Of Bottle Defects

TYPES OF BOTTLE DEFECTS MARK

DESIGNATION

ZONES

CAUSES

D1

Pearlescence, silver colour in the side part.

3

- Preform temperature too low at blowing

D2

Opalescence, crystallization commences.

2, 3, 4

- Preform temperature too high at blowing

D3

External folding of the base (button)

4

- Preform base not correctly heated - Pre-blowing pressure too low - Pre-blowing too late

4

-

D4

Internal folding of the base

Bad heat profiling Preform base not correctly heated Pre-blowing too late Pre-blowing pressure too low

D5

Too much material on the base (Excrescence).

4

- Preform base not correctly heated - Pre-blowing too late - Pre-blowing pressure too low

D6

Base off-centered.

4

- Pre-blowing pressure too high - Pre-blowing too early - Stretching rod not correctly adjusted

D7

Internal folding in the neck area

2

- Pre-blowing pressure too low - Pre-blowing too late - Bad heat profiling

SOLUTIONS - Increase temperature of the oven or of the involved zone - Reduce temperature of the oven or of the involved zone - Increase temperature of the oven or of the involved zone - Increase pre-blowing pressure - Pre-blow earlier - Reduce temperature of the oven or of the involved zone - Pre-blow earlier - Increase pre-blowing pressure - Increase temperature of the oven or of the involved zone - Pre-blow earlier - Increase pre-blowing pressure - Reduce pre-blowing pressure - Pre-blow later - Adjust the gap between stretching rod and base mould - Increase pre-blowing pressure - Pre-blow earlier - Increase temperature of the oven or of the involved zone - Reduce temperature of the oven or of the involved zone

MARK

DESIGNATION

ZONES

CAUSES

SOLUTIONS - Check spindle water circuit and spindle safety - Check that the over ventilators operate correctly and check adjustment of air admission - Adjust blow nozzle position (adjust spring pressure) - Adjust the height of spindles safety/neck (2 or 3 mm above the neck ring) - Adjust the height of spindles safety/neck (2 or 3 mm above the neck ring) - Reduce pre-blowing pressure - Remove the beginning of high pressure blowing of stretching end - Retighten mould locking - Increase mould temperature - Increase blowing pressure - Blow earlier - Adjust heat profiling

D8

Neck deformed.

1

- Abnormal heating of spindles or spindle protection - Air does not circulate correctly in the oven - Blow nozzles bearing too much

D9

Marks on bottle body

2, 3, 4

- Preform bad quality

D10

Flats on split line

2, 3

- Pre-blowing pressure too high

D11 D12

Distinct split line. Not correctly shaped.

2 et 3 2, 3, 4

D13

Petaloid base not correctly shaped.

4

-

D14

Locale deformation of the bottle when off the machine.

2 et 4

- Blowing pressure too late

- Reduce mould temperature

D15

Excess thickness in the form of rings.

2 et 3

D16

Defective circumferential thickness distribution.

2 et 3

D17

Defective longitudinal thickness distribution.

2, 3, 4

D18

Bottle volume changes when ageing.

2, 3, 4

R11 R3 R4 - Check preform geometry - Adjust heat profiling - Increase pre-blowing pressure - Reduce pre-blowing pressure - Pre-blow earlier - Pre-blow later R13 - Blow earlier

D19

Insufficient compression strength.

2, 3, 4

- Pre-blowing pressure too low - Bad heat profiling - Irregular rotation of preforms - Preform incorrect geometry - Bad heat profiling - Pre-blowing pressure too low - Pre-blowing pressure too high - Pre-blowing too late - Pre-blowing too early - Blowing pressure too low - Blowing pressure too late See D16&D17 - Mould temperature too low - Material viscosity too low

D20

Bottle bursting when dropped.

4

-

Mould locking loose Mould temperature too low Blowing pressure too low Blowing pressure too late Bad heat profiling

Base not correctly bi-oriented Preform base not correctly heated Pre-blowing pressure too low Pre-blowing too late

- Increase mould temperature - Check material quality - Check preform injection point - Adjust the height of spindles safety/neck (2 or 3 mm above the neck ring) - Increase pre-blowing pressure - Increase temperature of the oven or of the involved zone - Pre-blow earlier

MARK

DESIGNATION

ZONES

D21

Anormal carbonation loss

1

D22

Too much creeping

2, 3, 4

D23

Bottle bursting under abnormally low

3 et 4

D24

Opalescent lines at the bottom of the bottles

3 et 4

CAUSES See D8 - Preform temperature too high at blowing - External upper side of neck scratched or not complete See D16&D17 - Material viscosity too low - Base not correctly bi-oriented - Preform base not correctly heated - Pre-blowing pressure too low - Pre-blowing too late - Weak at injection point - Material viscosity too low - Preform manufacturing mould too cold

SOLUTIONS - Reduce temperature of the oven or of the involved zone - Check preform quality (impacts, scratches, sticking, full filling) - Check material quality - Increase temperature of the oven or of the involved zone - Increase pre-blowing pressure - Pre-blow earlier - Check preform injection point - Check material quality - Check preform quality (impacts, scratches, sticking, full filling)

CAUSES OF BOTTLE DEFECTS C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29

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Preform temperature too low at blowing Preform temperature too high at blowing Preform base not correctly heated Bad heat profiling Abnormal heating of spindles or spindle protection Air does not circulate correctly in the oven Stretching pressoure too low Stretching rod not correctly adjusted Pre-blowing too early Pre-blowing too late Pre-blowing pressure too low Pre-blowing pressure too high Blowing pressure too early Blowing pressure too late Blowing pressure too low Blowing pressure too high Blow nozzles bearing too much Mould locking loose Mould temperature too high Mould temperature too low Base not correctly bi-oriented Weak at injection point Incorrect base thickness External upper side of neck scratched or not complete Preform bad quality Material viscosity too low Irregular rotation of preforms Preform incorrect geometry Preform manufacturing mould too cold

SOLUTIONS OF BOTTLE DEFECTS S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26

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Increase temperature of the oven or of the involved zone Reduce temperature of the oven or of the involved zone Adjust heat profiling Check spindle rotation Check spindle water circuit and spindle safety Check that the over ventilators operate correctly and check adjustment of air admission Adjust the gap between stretching rod and base mould Increase atretching pressure Pre-blow earlier Pre-blow later Increase pre-blowing pressure Reduce pre-blowing pressure Increase blowing pressure Reduce blowing pressure Blow earlier Blow later Adjust blow nozzle position (adjust spring pressure) Retighten mould locking Increase mould temperature Reduce mould temperature Check preform geometry Check material quality Check preform injection point Check preform quality (impacts, scratches, sticking, full filling) Adjust the height of spindles safety/neck (2 or 3 mm above the neck ring) Remove the beginning of high pressure blowing of stretching end