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Parameter Setting for Seal Process of the Rice Packaging

1* 2 1

2 E-mail: chawalit.ma@spu.ac.th*

Chawalit Manisri1* Chaiwat Pukpugk2

1Department of Industrial Engineering, Faculty of Engineering, Sripatum University 2Department of Mechanical Engineering, Faculty of Engineering, Sripatum University

E-mail: chawalit.ma@spu.ac.th*

5

20,000 2

110+12 m 90+20 m 80.26

ASTM F88/F88M -06

33 3

0.05 9.53 9.11 4.22 3.62

25.4

Abstract

Rice is the main agricultural product of Thailand that has been produced for distributing in various

formats. A 5-kilogram bag of rice is hugely popular in the consumer market, which is worth up to 20,000

million baht. Many manufacturers increased production to meet customer needs. However, the quality of the packaging is a major obstacle to productivity. It is found that defects of two types of rice bags, a thick

bag with 110 +12 m and a slim bag with 90 +20 m are a torn seal, non bonding seal, and folded seal.

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This totally causes 80.26 percent of waste. The problem is, therefore solved by studying the production line and then writing in a cause and effect diagram to find out causes. F88/F88M -06 standard test

method for seal strength of flexible barrier materials or ASTM is also used instead of the testing by

human that cannot provide accurate value or standard value. In addition to factor screening by brainstorming, it shows that factors affecting the seal strength are the thickness of bags, heating time,

and pressing time with blowing cold air. The experimental design is a 33 full factorial design and repeated three times for each level. The findings reveal interaction of thickness with heating time,

thickness with pressing time and blowing cold air, heating time with pressing time and blowing cold air, and all three main factors significantly affect to the seal strength at the level of 0.05 .

The appropriate parameters are set to test to confirm that there is no waste. The average seal strength at four testing points is 9.53, 9.11, 4.22, and 3.62 kgf/25.4 mm. width.

Keywords: Design of Experiment, Parameter Setting, Seal Strength

1.

80 70

20,000 150,000

5

5

2 3,375,000

12,971 1 1 0.38

10,381 80

150

1,500,000

1 5

( )

1,280

Seal 10,381

784

470

56

1 5

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2.

7 (QC 7 Tools) [1] 3

(Check Sheet)

(Pareto Chart)

80-20 ( )

(Cause-Effect Diagram) 4 (4M)

(Man) (Method)

(Method) (Materials)

(Screening Factor) 2k

(2k Full Factorial Design) [2], [3]

4

[4]

[5] 2k 5

pH

3

(Brainstorms)

[6]

3k (3k Full Factorial Design) [2], [3]

3 (Response

Surface Methods) 3k Full Factorial Design

[5]

[4], [5], [6]

ASTM F88/F88M -06

(Standard Test

Method for Seal Strength of Flexible Barrier Material) [7]

�N/25.4 mm.� �kgf/25.4 mm.�

[4]

[4] 2

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[8] 3 ,

3.

QC 7 Tools

3.1

2 2

2

3.2

2555 ( 2554 2555

)

3 80

3

4 5-7

3

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4

5 ( )

6 ( )

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7 ( )

3.3

( )

(Drop Test)

() 30

( .) ASTM F88/F88M -06

2

2 ( )

(kgf/25.4 mm. width)

4.66 3.93 2.54 0.35

(90+2

0 m) 4.99 4.21 3.50 0.37

8.97 7.99 6.38 0.68 (100+

12

m)

8.81 6.61 2.18 1.50

3.4

8

33 (Treatment)

3 (Replications) 2 324

(Seal Strength)

3-6

3

( )

(-1) (0) (1)

( m)

110+10 110+12 110+15

Seal

( )

0.6 0.7 0.8

+

( )

0.4 0.5 0.6

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8

4

( )

(-1) (0) (1)

( m)

90+10 90+15 90+20

Seal

0.35 0.45 0.55

+

0.45 0.55 0.65

5

( )

(-1) (0) (1)

( m)

110+10 110+12 110+15

Seal 0.55 0.65 0.75

+

0.4 0.5 0.6

6 ( )

(-1) (0) (1)

( m) 90+10 90+15 90+20

Seal

0.32 0.42 0.52

+

0.67 0.87 0.99*

*

4.

Seal Strength

7

12

(P-

Value =

0.244)

(P-

Value =

0.114)

(P-

Value =

0.051)

(P-

Value =

0.074)

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0.05 P-value

0.05

Seal Strength

Minitab Release 15

( ) - (

) 2 ( ,

) Seal Strength

9 ( )

( ) - (

) Seal Strength P-Value < 0.05

90% 2 ( ) Seal

Strength P-Value < 0.10

10 ( )

( ) - ( ) 2 (

)

3 () Seal

Strength

11 ( )

( ) - () 2 (

) Seal Strength

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12 ( )

(Interaction

Plot)

13

10

13

Thickness ( m)

( )

Heat Time

( )

( )

Press Time

( )

( ) Heat Time

( )

( ) Press Time

( )

( )

Seal

Strength

(kgf/25.4

mm. width)

1 110+10 0.70 0.60 0.65 0.50 - 9.53 / 9.11

2 90+20 0.35 0.55 0.42 0.67 - 4.22 / 3.62

5.

0.05 2

3

9.53 9.11 4.22 3.62 25.4

[1] Montgomery, Douglas C. 2008. Introduction to Statistical Quality Control. 6th Edition, Wiley,

USA. [2]

. 2552. , , .

[3] Montgomery, Douglas C. 2004. Design and

Analysis of Experiments. 6th Edition, Wiley, USA.

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[4] . 2547.�

.� 13

. .2547 : 1141-1148. [5] . 2550. �

: .�

.

[6] . 2555. �

.� 21 . .2555:

944-950.

[7] ASTM International. 2006. F88/F88M-06 Standard Test Method for Seal Strength of

Flexible Barrier Materials. USA. [8] Pratricia Mays. 2008. �Seal Strength Models for

Medical Device Trays�, Doctoral Dissertation, Industrial Engineering, Texas A&M University,

USA.