Overview
The ELVS carton erector can handle a wide range of carton sizes, but only specific dimensions are quotable — meaning they will run reliably on the machine. This article explains the dimensional constraints that determine whether a carton is quotable for the ELVS and how to verify your carton specifications.
Step 1 — Understand the Three Dimensional Constraints
Every quotable carton must satisfy three independent dimensional requirements based on carton length, width, and height.
| Dimension | Quotable Range | What It Means |
|---|---|---|
| Length (L) | 8" to 27" | The longest side of the carton base |
| Width (W) | 5" to 20" | The shorter side of the carton base |
| Height (H) | Calculated per Step 2 | The vertical dimension of the carton |
Step 2 — Verify the Height-Width Relationship
The ELVS has a unique constraint: the height of the carton is not evaluated independently. Instead, half the width plus the height must fall within a specific range.
How to calculate:
- Take the carton width
- Divide it by 2
- Add the carton height
- Check that the result is between 6" and 33"
Example 1 — Quotable Carton:
- Length: 12", Width: 8", Height: 10"
- Calculation: (8 ÷ 2) + 10 = 4 + 10 = 14"
- Result: 14" is within 6" to 33" ✅ Quotable
Example 2 — Non-Quotable Carton:
- Length: 20", Width: 18", Height: 20"
- Calculation: (18 ÷ 2) + 20 = 9 + 20 = 29" ✅ Within range
- BUT see Step 3 — must also check the length-to-width ratio
Step 3 — Check the Length-to-Width Ratio
The ELVS cannot reliably handle cartons where the length is more than 2.5 times the width. This ensures stable handling and pickup during the erection process.
How to calculate:
- Divide the carton length by the carton width
- Verify the result is less than 2.5
Example 1 — Quotable Ratio:
- Length: 18", Width: 10"
- Calculation: 18 ÷ 10 = 1.8
- Result: 1.8 < 2.5 ✅ Quotable
Example 2 — Non-Quotable Ratio:
- Length: 24", Width: 8"
- Calculation: 24 ÷ 8 = 3.0
- Result: 3.0 is NOT less than 2.5 ❌ Non-Quotable
Step 4 — Square Carton Special Case (L = W)
When a carton has equal length and width dimensions, special construction is required for reliable operation on the ELVS.
Why notching is required: Square cartons present a symmetry challenge — the ELVS pickup arm cannot determine orientation without reference marks. Notches provide the necessary tactile and visual reference for the vacuum system to achieve a secure grip.
Example:
- Length: 10", Width: 10" (square carton)
- Height: 8"
- Status: ❌ Not quotable unless notches are added
- With notches: ✅ Quotable
Quick Reference — Is Your Carton Quotable?
Use this checklist to determine if a carton is quotable for the ELVS:
- Length: Is it between 8" and 27"?
- Width: Is it between 5" and 20"?
- Height Formula: Is (½W + H) between 6" and 33"?
- Length-to-Width Ratio: Is L/W less than 2.5?
- Square Carton: If L = W, are notches present?
Common Mistakes
| Mistake | Result | Fix |
|---|---|---|
| Only checking length and width, ignoring the height formula | Assumes a carton is quotable when the height-width relationship violates constraints — machine may not run or runs unreliably | Always calculate (½W + H) and verify it is between 6" and 33" |
| Forgetting to check the L/W ratio | Long, narrow cartons may be quoted but fail on the ELVS due to stability and grip issues | Always divide length by width and confirm the result is less than 2.5 |
| Using a square carton without notches | The ELVS pickup arm cannot grip the carton reliably — repeated pickup failures and carton drops | Add interior notches to the carton base, or request a non-square alternative from the customer |
| Assuming all cartons within stated length/width ranges are quotable | Cartons near the upper height limits may exceed the 33" maximum when the formula is applied | Always complete all four constraint checks — no single dimension guarantees quotability |
| Rounding intermediate calculations | Edge-case cartons are incorrectly classified as quotable or non-quotable | Carry decimals through calculations; round only the final result when comparing to constraints |
Comments
0 comments
Article is closed for comments.