Poly Film Roll Needed Calculator

Plan actual fixed-order film-drop cutting using next-fit roll packing and explicit between-cut kerf; not an optimal bin-packing claim, area-only purchasing or fabric-width compatibility.

Description

Film-drop cuts can be assigned sequentially to rolls.

Film-drop cuts can be assigned sequentially to rolls. Cutting order and between-cut loss affect a next-fit plan.^[1]

Enter 1–128 positive drop lengths, positive usable roll length and nonnegative kerf; each drop must fit one roll. Return roll count, zero-based assigned roll numbers and remaining lengths.

When to use Poly Film Roll Needed Calculator

Use Poly Film Roll Needed Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. Input order is preserved. This is not optimal bin packing or a width-compatibility check.

Prepare the measured crop, container, lighting or inventory records requested. Supply verified local catalogs, calibration factors and crop-stage limits; keep units and dates consistent.

How to use Poly Film Roll Needed Calculator and understand its results

Prepare the measured crop, container, lighting or inventory records requested. Supply verified local catalogs, calibration factors and crop-stage limits; keep units and dates consistent.
Enter panelDropLengthsM, usableRollLengthM, callerKerfBetweenCutsM using the field table and calculation rules, then run the tool.
Read requiredSequentialRollCount, assignedRollNumbers, unusedRollLengthsM. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
panelDropLengthsM	Panel drop lengths m	list of number	Required
usableRollLengthM	Usable roll length m	number	Required
callerKerfBetweenCutsM	Caller kerf between cuts m	number	Required

Enter 1–128 positive drop lengths, positive usable roll length and nonnegative kerf; each drop must fit one roll. Return roll count, zero-based assigned roll numbers and remaining lengths.

use current roll if nextLength+betweenCutKerf fits; otherwise start next roll

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
requiredSequentialRollCount	Required sequential roll count	number
assignedRollNumbers	Assigned roll numbers	list of number
unusedRollLengthsM	Unused roll lengths m	list of number

json

{
  "input": {
    "panelDropLengthsM": [
      3,
      4,
      2
    ],
    "usableRollLengthM": 5,
    "callerKerfBetweenCutsM": 0
  },
  "output": {
    "requiredSequentialRollCount": 3,
    "assignedRollNumbers": [
      0,
      1,
      2
    ],
    "unusedRollLengthsM": [
      2,
      1,
      3
    ]
  }
}

Limitations and assumptions

Input order is preserved. This is not optimal bin packing or a width-compatibility check.

Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Covering Plastic Width Length Calculator: A continuous greenhouse cover can be budgeted from its measured cross-section path. Total anchoring and end allowances are explicit additions. For a complementary task, use Greenhouse Perimeter Baseboard Length Calculator: A baseboard length budget subtracts openings and adds specified allowances. Whole boards from total length are only a purchasing lower bound.

References

Poly Film Roll Needed Calculator — tool.io

Similar or alternative tools

Covering Plastic Width Length Calculator
A continuous greenhouse cover can be budgeted from its measured cross-section path. Total anchoring and end allowances are explicit additions.
Greenhouse Perimeter Baseboard Length Calculator
A baseboard length budget subtracts openings and adds specified allowances. Whole boards from total length are only a purchasing lower bound.