Tài liệu Package Evaluation Training_3_transversalsealing

22/09/2012 Package Evaluation T i i Training Transversal Sealing (TS Seal) PE-03/2012-04-01 Agenda 1. Principle of Transversal sealing 2. Evaluation - Tear down method + Practical 3. Evaluation - Dissolving test method + Practical 4. Evaluation - Heat Pattern + Practical 5. Evaluation - TS integrity by red ink + Practical 6 Example of TS defect 6. PE-03/2012-04-01 / 2 1 22/09/2012 1. Principle of TS sealing li Transversal Sealing (TS Seal) PE-03/2012-04-01 1. Principle of TS sealing What do we need to seal? Too short sealing time will affect proper heat diffusion through the polymer PE-03/2012-04-01 / 4 2 22/09/2012 1. Principle of TS sealing Polyethylene Sealing – Microscopic Scale PE-03/2012-04-01 / 5 1. Principle of TS sealing General information on TS Sealing The heat required to melt the sealing layer of the packaging material is generated by induction in the aluminium foil in the packaging material ► TPIH sealing systems can produce short pulses with sufficient heat ► The heat is transferred directly to the sealing area ► PE-03/2012-04-01 / 6 3 22/09/2012 1. Principle of TS sealing Jaw System PE-03/2012-04-01 / 7 1. Principle of TS sealing Definition PE-03/2012-04-01 / 8 4 22/09/2012 1. Principle of TS sealing Thermograph of Transversal Seal PE-03/2012-04-01 / 9 1. Principle of TS sealing Induction Network PE-03/2012-03-01 / 10 5 22/09/2012 1. Principle of TS sealing TS sealing components TPIH 2000 TPIH 2500 Generator Transformer Inductor PE-03/2012-04-01 / 11 1. Principle of TS sealing TBA/19 – Component of the jaw system PE-03/2012-04-01 / 12 6 22/09/2012 1. Principle of TS sealing TBA/19 – Sealing jaw components PE-03/2012-04-01 / 13 1. Principle of TS sealing TBA/19 – Pressure jaw components PE-03/2012-04-01 / 14 7 22/09/2012 1. Principle of TS sealing Chain – Sealing jaw components Inductor Busbar Carbon Brush PE-03/2012-04-01 / 15 1. Principle of TS sealing Chain – Pressure jaw components Knife Spring Bushing Dolly PE-03/2012-04-01 / 16 8 22/09/2012 1. Principle of TS sealing Principle of ridge induction heating (IH) PE-03/2012-04-01 / 17 2. Evaluation - Tear d down method th d Transversal Sealing (TS Seal) PE-03/2012-04-01 9 22/09/2012 2. Evaluation - Tear down Evaluation concept The method consists of pulling TS (1) apart using the stretch pliers (2) and examining how the seal separates. ► Seal must be mechanically stronger than the materials. If the sealing g is g good,, the packaging material/strip layers (plastic film, Al-foil or paperboard) break while the seal does not separate. ► Seal is stronger than materials PE-03/2012-04-01 / 19 2. Evaluation - Tear down Definition ► Blocked seal Blocked seals, or cold seal, is when the inner packaging material layers have not completely merged. Separation takes place between the sealing layers. ► Plastic lump Plastic lump is a plastic residue that solidifies out of the dolly area. Plastic lumps are a potential danger, the hard residue might punch the packaging material layers during distribution of the package compromising package integrity. PE-03/2012-04-01 / 20 10 22/09/2012 2. Evaluation - Tear down Preparation of the samples – TS rough check Unfold the top and bottom flaps of the packages PE-03/2012-04-01 / 21 2. Evaluation - Tear down Check of the samples – TS rough check ► Checking the integrity of the TS by gently squeezing the package with the fingers. ► If there is product leakage, the TS has a gross defect (most likely a dolly is missing) PE-03/2012-04-01 / 22 11 22/09/2012 2. Evaluation - Tear down Preparation of the samples – TS accurate check St 1: Step 1 Cut C t off ff the th top t and d bottom of the packages at a distance of about 25 – 30 mm, from the top and bottom fin creases. Rinse the samples and dry p them with either compressed air or soft tissue. Note! Use compressed air with care since it might damage the sample. PE-03/2012-04-01 / 23 2. Evaluation - Tear down Preparation of the samples – TS accurate check Step 2: St 2 Cut C t off ff 1 mm max from the edges (at the corner). Note: It is recommended to start cutting from the outside in order to have control over that important section. PE-03/2012-04-01 / 24 12 22/09/2012 2. Evaluation - Tear down Check of the samples – TS accurate check Step 1: Run your finger over the TS and check if there are plastic lumps or ridges. Plastic lumps show that the sealing is not correct. PE-03/2012-04-01 / 25 2. Evaluation - Tear down Check of the samples – TS accurate check Step 2: Place the sample in the stretch pliers and gently squeeze the handles to stretch the seal. Good light is important when evaluation the seal quality PE-03/2012-04-01 / 26 13 22/09/2012 2. Evaluation - Tear down Check of the samples – TS accurate check Step 3: Stretch by pressing the plier handles along the whole length of the sample. Stretch a little bit at a time, both ends (1) towards the LS/TS cross (3), stretch the LS/TS cross last. last PE-03/2012-04-01 / 27 2. Evaluation - Tear down Critical points of the transversal seal are: 1. The cross : which is the point where the TS and LS meet 2. The corners : which are at the ends of the package. PE-03/2012-04-01 / 28 14 22/09/2012 2. Evaluation - Tear down Evaluation of the samples Defective seal “Plastic lump” Before pulling the seal apart, check that there are no plastic lump in the sealing. Use your fingernails to detect plastic lump. p p Plastic lumps (1) are a potential danger, hard residue might punch the PM layers during distribution of the package. PE-03/2012-04-01 / 29 2. Evaluation - Tear down Evaluation of the samples Good seal The wave (1) is still encapsulated in the heated area and will not d t determine i integrity issues. PE-03/2012-04-01 / 30 15 22/09/2012 2. Evaluation - Tear down Evaluation of the samples Good seal The seal does not come apart; the plastic film stretches and breaks, leaving the paperboard uncovered. PE-03/2012-04-01 / 31 2. Evaluation - Tear down Evaluation of the samples Good seal At the cross where TS and LS meet, the LS must be considered as additional plastic multilayer. Below picture shows the LS which stretches and separates. PE-03/2012-04-01 / 32 16 22/09/2012 2. Evaluation - Tear down Evaluation of the samples Good seal The seal does not come part; the plastic film breaks leaving Al-foil uncovered. PE-03/2012-04-01 / 33 2. Evaluation - Tear down Evaluation of the samples Good seal The seal does not come part; the plastic film stretch. PE-03/2012-04-01 / 34 17 22/09/2012 2. Evaluation - Tear down Evaluation of the samples Defective seal “Bl k d seal” “Blocked l” The seal separates; no rupture occurs in the material layers. The seal appears mattish or greyish. PE-03/2012-04-01 / 35 2. Tear down method and practice Evaluation of the samples Defective seal “Blocked seal” The seal separates; no rupture occurs in the material layers. The seal appears mattish or greyish. greyish PE-03/2012-04-01 / 36 18 22/09/2012 2. Evaluation - Tear down Evaluation of the samples Defective seal - “Overheated” The seal is overheated; the two PE layers are burnt and the Al-foil shows micro cracks and cuts. PE-03/2012-04-01 / 37 2. Evaluation - Tear down Evaluation of the samples Good Seal - At corner, seal above the ridge Blocked Seal - At corner, seal below the ridge PE-03/2012-04-01 / 38 19 22/09/2012 3. Dissolving method and d practice ti Transversal Sealing (TS Seal) PE-03/2012-04-01 3. Dissolving method and practice Introduction ► Procedure application: − During production − Quality control − Troubleshooting ► Procedure: − Chemical reaction, from the multilayer structure to the inside pouch, via acid or alkali reaction − Heat pattern assessment and red ink tightness of each sealing jaw PE-03/2012-04-01 / 40 20