The compatibility of paper and coating materials in slow paper bowl machines (with a production rate of less than 35-40 pieces per minute) needs to be comprehensively analyzed according to the processing characteristics of the equipment and the physical properties of the materials. Specific compatibility solutions are as follows:
I. Paper Type Compatibility
Single-sided PE laminate
Weight range: 140-320g/m2 (regular model) or 180-450g/m2 (double-sided laminated models for extended compatibility).
Application scenarios: Regular hot drink bowl (e.g. milk tea, coffee), cold drink bowl (e.g. ice cream cups).
Process Advantages: Single-sided PE coating with basic waterproofing, oil resistance, low cost, suitable for low speed production, cost control per bowl (approx. 6-20 cents per bowl).
Typical: ZW-LII double-sided laminated paper bowl machine (switching between single-sided and double-sided modes), MG-X35 paper bowl forming machine (support 240-330g/m2 single and double-sided coated paper).
Double sided PE laminate
Weight range: 180-450g/m2 (equipment required to support double-sided coating process).
Application scenarios: High water resistance requirements (e.g. soup bowls, instant noodles bowls), long-term storage of hot food (e.g. food boxes).
Process advantages: double-sided coating improves overall anti-permeation performance paper, prevents the paper from absorbing moisture and deformation due to high temperature food, and is suitable for low speed production to achieve stable quality.
Typical model: ZW-LII fully automatic double-sided laminated paper bowl machine (supports 20-60 ounce sizes, 35-40 bowl/ min.).
Kraft paper
Weight range: 280-350g/m2 (combination of single PE coating required).
Application scenarios: Eco-friendly catering packaging (such as salad bowls, light food boxes), square paper bowls (special mold support equipment required).
Process advantages: Kraft paper's natural texture improves packaging quality, single-layer PE coating meets basic waterproofing requirements, suitable for low speed differential production.
Typical case: Fully automated square paper bowl molding machine (supports 500-900ml capacity and uses 300g brown paper + single machine PE).
PLA Biodegradable Materials
Weight range: 160-220g/m2 (equipment matching cryogenic molding process required).
Application scenarios: Environmentally friendly and demanding scenes (such as takeout food boxes, cold drink cups).
Process advantages: PLA is made from plant materials such as corn starch and is biodegradable, but needs to avoid high-temperature deformation and is suitable for low-speed production to control heating temperature.
Compatibility conditions: Equipment must have the function of low-temperature heat sealing function (such as ultrasonic welding process) to avoid the damage of traditional high temperature heating to the structure of PLA.
II. Coating Material Compatibility
PE Coating (polyethylene)
Features: Waterproof, oil resistant, high temperature (up to 120°C), low cost, mainstream coating material.
Compatible Process: Heat sealing (requires temperature adjustment of equipment heating module, e.g. MG-X35 model supports variable frequency temperature control).
Note: Single-sided PE coating is suitable for low waterproofing requirements, while double-sided PE coating requires equipment with the ability to handle double-sided coating.
PLA Coating
Features: Biodegradable, environmentally friendly, but poor heat resistance (up to 80°C) and requires cryogenic molding.
Compatible Process: Ultrasonic welding (for example, MG-X35 model uses ultrasonic automatic welding to avoid high temperature damage to PLA).
NOTE: Equipment must support cryogenic processing and production speed should be controlled to a reasonable extent (e.g. under 35 pieces perminute) to avoid material overheating.
PET Coating (Polybutylene Terephthalate)
Features: High strength, chemical corrosion resistance, but high cost, often used in high-end packaging.
Compatible Process: Equipment is required to have high precision coating processing capability (such as ZW-LII model support for double-sided coating, suitable for PET composites).
Note: It is necessary to confirm with the supplier whether the equipment supports the heat sealing temperature requirements PET coated materials.
III. Selection Suggestions
Select coating type according to production requirements:
Regular hot drink bowl: Single sided PE coating + 140-220g/m2 paper of paper (cost preferred).
Bowls with high water resistance requirements: Double sided PE coating + 240-330g/m2 paper (quality preferred).
Eco-friendly: PLA paint + 160-220g/m2 paper of paper (low temperature process requires equipment support).
Verify equipment compatibility:
Confirm whether the device supports the target paper weight range (e.g., ZW-LII type supports 180-450g/m2).
Verify that the equipment has a processing process for the target coating material (e.g. ultrasonic welding, low-temperature heat sealing).
