Paper Cup Machine Bottom Forming Troubleshooting

Document 1: Paper Cup Machine Bottom Forming Troubleshooting | Roller Die Height & Pressure Commissioning Guide

May 27, 2026

Brand: Shunda | Manufacturer: Haining Chengda Machinery Co., Ltd.

Document Keywords: paper cup bottom forming fault, roller bottom die adjustment, knurling wheel pressure setting, paper cup machine bottom defect fixing

Meta Description: Learn standard commissioning methods for Shunda paper cup machine bottom forming system, including roller bottom die height calibration, center concentricity adjustment and knurling wheel pressure setting to solve cup bottom forming defects.

This professional technical guide focuses on common bottom forming problems and standard commissioning operations of Shunda automatic paper cup forming machines. Reasonable adjustment of roller bottom die height, center position and knurling wheel pressure is the core key to eliminate cup bottom deformation, uneven forming and assembly failure, which effectively improves paper cup bottom molding quality and production stability.

1. Bottom Forming Faults and Commissioning Standards

1.1 Roller Bottom Die Height Adjustment

Remove the roller bottom die and install the knurling wheel. Run the roller bottom mechanism to the maximum stroke position, then measure the fitting gap between the upper end of the knurling wheel and the lower end of the die. The standard gap is controlled at 0.5mm～1mm. This gap range ensures stable knurling forming, avoids insufficient bottom pressing or excessive die wear, and matches the forming standard of conventional disposable paper cups.

1.2 Center Concentricity Adjustment

Keep the roller bottom mechanism at the maximum stroke with the die assembled inside the roller bottom die. Use a feeler gauge or special test paper for the equipment to measure the peripheral gap between the roller bottom die and the die. The requirement is uniform gap on all sides without offset or uneven clearance. Eccentric deviation will directly cause cup bottom deviation, unilateral wrinkling and defective products, so regular center calibration is required in daily production.

1.3 Knurling Wheel Pressure Adjustment

Remove the die from the station, move the empty station to the roller bottom working position, and raise the roller bottom mechanism to the maximum stroke to visually check the fitting pressure between the roller bottom die and the knurling wheel. The optimal assembly state is as follows:the knurling wheel is in precise light contact with the inner wall of the roller bottom die, without over-pressure extrusion or floating gap. Excessive pressure will cause die abrasion and cup bottom indentation, while too loose pressure will lead to unclear bottom knurling and unformed cup bottom.