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What should we pay attention to when buying cosmetic tubes?- Maypak

September 06, 2023

Introduction: Cosmetic Tubes are the primary packaging for skincare products ( Plastic Cosmetic Tube / ABL Tube / Aluminum Tube / Super Nature tube / Sugarcane LDPE Tube and so on ), so their importance cannot be overstated. As a packaging purchaser, there are several key technical considerations when sourcing tubes to ensure quality. This article outlines the main technical points to look for when selecting tubes, from a quality perspective.The content is for reference only for purchasing friends:

1. Basic Quality Requirements for Cosmetic Tube Appearance

(1). Appearance requirements: In principle, when inspected visually from a distance of about 30cm under natural light or 40W daylight lamp, there should be no surface irregularities, imprints  (no oblique lines at the sealed end), scratches, scars, burns.

(2). The surface should be smooth, clean inside and out, with even polishing and gloss consistent with the standard sample. No obvious unevenness, excess stripes, scratches or imprints, deformations, wrinkles etc. No foreign matter adhesion, small irregularities do not exceed 5 points on the whole tube. For tubes with net content ≥100ml, 2 flowerings are allowed. For tubes with net content <100ml, 1 flowering is allowed.

(3). The tube body and cap should be flat, with no flash, no damage, no missing threads. The sealed end should be tight, the sealing lines aligned evenly, sealing width consistent, standard sealing height is 3.5-4.5mm, height difference of sealing lines on the same tube should be ≤0.5mm.

(4). Damage (any damage or rupture on tube or cap); blocked; paint peeling on tube surface >5mm2; cracked sealing end; broken end; severely deformed threads.

(5). Hygiene: Tube interior and exterior should be clean. No significant dirt, dust or foreign matter inside tube and cap. No dust, oil stains etc., no odors, and meets hygiene requirements for cosmetic grade packaging materials: total bacterial count ≤ 10 cfu, no detection of Escherichia coli, Pseudomonas aeruginosa or Staphylococcus aureus.

2. Requirements for Tube Surface Treatment and Graphic Printing

(1). Printing:

• Position deviation within confirmed upper and lower limits (≤±0.1mm), no double printing.

• Graphics and text are clear and complete, colors match the sample. Color difference between tube body and printing does not         exceed sample's range.

•Text size and thickness approximate the sample, no broken or smudged characters, no missing whites, does not affect legibility.

• Printed fonts have no obvious feathering or inking, are correct with no erroneous, missing, or incomplete characters, punctuation, strokes, blurring, etc.

(2). Graphics and Text: Printing alignment accurate, alignment error ≤1mm for main areas, ≤2mm for secondary areas. No obvious discolored patches or speckles.

• For tubes with net content ≥100ml, allow 2 spots ≤0.5mm each, total area ≤0.2mm2 on front, 3 spots ≤0.5mm each, total area ≤0.2mm2 on back.

• For tubes with net content <100ml, allow 1 spot ≤0.5mm, total area ≤0.2mm2 on front, 2 spots ≤0.5mm each, total area ≤0.2mm2 on back.

(3). Plate Deviation

• For tubes with net content ≥100ml, vertical plate deviation ≤±1.5mm, horizontal deviation ≤±1.5mm.

• For tubes with net content <100ml, vertical deviation ≤±1mm, horizontal deviation ≤±1mm.

(4). Content Requirements: Consistent with agreed films and samples.

(5). Color Tolerance: Printing and metallizing colors match agreed samples, color deviation within agreed upper and lower limits.

3. Basic Requirements for Cosmetic Tube Product Structure

(1). Size specifications: Measure with vernier calipers according to design drawings, tolerances within specified ranges on drawings:

• Diameter - Max allowed deviation 0.5mm

• Length - Max allowed deviation 1.5mm

• Thickness - Max allowed deviation 0.05mm

(2). Weight requirements: Measure with 0.1g precision scale, standard value and allowed error within agreed range:

Max allowed deviation is 10% of sample weight.

(3). Full capacity: Fill container level with 20°C water, full capacity is mass of water filled, standard value and error range per agreement:

• Max allowed deviation is 5% of sample full capacity.

(4). Wall thickness consistency (for tubes with content >50ML): Cut open tube, measure 5 points each at top, middle, bottom with thickness gauge, max allowed deviation no more than 0.05mm.

(5). Material requirements: As stipulated in the contract between supplier and purchaser, tested according to relevant national industry standards, consistent with sealed sample.

4. Basic Requirements for Cosmetic Tube Sealed End

(1). Sealing method and shape meets contractual requirements of both parties.

(2). Sealing end height meets contractual requirements of both parties.

(3). Sealing is centered, straight, with left-right deviation ≤1mm.

(4). Seal integrity:

• Fill with specified capacity of water, place between top and bottom plates with cap portion outside the plates. Apply 10kg pressure at middle of top plate for 5 minutes. No bursting or leakage at sealed end.

• Apply 0.15Mpa air pressure inside tube using air gun for 3 seconds. No seal bursting.

5. Requirements for Fit Between Tube and Accessories

(1). Fit tightness:

• Torque test (for threaded closures): When screwing on the threaded cap to the tube opening with 10 kgf/cm torque, there should be no damage to tube or cap, no slipping of threads.

• Opening force (for snap-on caps): The opening force should be appropriate.

(2). No skewing of tube or cap after fitting.

(3). After tube and cap are fitted, the gap should be uniform and consistent, with no obstructed feeling when running finger along gap. Max gap within agreed range (≤0.2mm).

(4). Seal integrity tests:

• Fill tube with about 9/10 maximum capacity with water, fit on matching cap (with liner if required), place horizontally in vacuum dryer, evacuate to -0.06MPa and hold for 5min, no leakage.

• Fill tube with specified net content of water, tighten cap and leave at 40°C horizontally for 24h, no leakage.

6. Functional Requirements for Cosmetic Tubes

(1). Pressure resistance: Can refer to the following two methods:

• Fill tube with about 9/10 maximum capacity with water, fit on matching cap (with liner if required), place horizontally in vacuum dryer, evacuate to -0.08MPa and hold for 3min, no bursting or leakage.

• Randomly select 10 samples from each batch; fill sample tubes with same weight or volume of water as product net content, place horizontally naturally; apply specified pressure vertically to tube body for 1 minute, pressure head area ≥1/2 container bearing area.

(2). Drop test: Fill with specified content capacity, tighten cap, drop freely from 120cm height onto cement floor, no bursting, seal bursting, leakage. No loose tube and cap fitting, no cap coming off.

(3). Low temperature and high temperature resistance (compatibility test):

• Fill content into tube or immerse test piece in content, place at 48°C, -15°C for 4 weeks, no change in tube, test piece or content is acceptable.

• Test 1 batch per 10 material batches; take 3 caps from each cavity in a batch, with at least 20 sets combined with tubes; fill tubes with same weight or volume of water as net content; place 1/2 of samples in 48±2°C constant temperature oven for 48h; place other 1/2 of samples in fridge cooled to -5°C to -15°C for 48h; take out samples and restore to room temperature and inspect appearance. Acceptance criteria: No bursting, deformation (permanent shape change), discoloration of tube or cap. No sealed end cracking, broken end, etc. for tube.

(4). Yellowing test: Place tube under UV light for 24h or sunlight for 1 week, no significant discoloration compared to standard sample.

(5). Compatibility test: Fill content into tube or immerse test piece in content, place at 48°C, -15°C for 4 weeks, no change in tube, test piece or content is acceptable.

(6). Adhesion requirements:

• Tape peel test: Apply 3M 810 tape to test area, smooth out (no bubbles), then peel off forcefully and quickly. Tape should have no significant ink, metallizing (ink/metallizing loss <5% of total printed area), or large areas of oil (loss <10% of total area) for pass.

• Content impact: Rub test area back and forth 20 times with finger dipped in content. No discoloration of content or ink loss is pass.

• Metallizing cannot have loss >0.2mm diameter, no broken lines or characters. Position deviation ≤0.5mm.

• Screen printing, tube surface layer, metallizing: Test 1 batch per 10 material batches, randomly select 10 samples per batch, immerse in 70% alcohol for 30mins. No loss of tube surface layer, failure rate ≤1/10.

*Maypak packaging is Cosmetic Tubes Manufacturer and has been focusing on acrylic cosmetic containers for more than 17 years and was established in 2006,the company enjoys a good reputation at home and abroad. If you have any questions about lipstick tubes, please contact us.

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