paper curl

2000 ◽  
pp. 1222-1222
Author(s):  
Martin H. Weik
Keyword(s):  
Paper Curl

Multiphysics simulation of paper curl due to moisture transport

2020 ◽  
Vol 34 (5) ◽  
pp. 2075-2083
Author(s):  
Gil Ho Yoon ◽  
Byoungho Yoo ◽  
Woon Kyung Kim ◽  
Junseong Woo ◽  
Taehan Kim ◽  
...  
Keyword(s):  
Moisture Transport ◽  
Multiphysics Simulation ◽  
Paper Curl

Distortion Correction of a Quick Response Code Image

2013 ◽  
Vol 431 ◽  
pp. 312-317
Author(s):  
Xue Min Cheng ◽  
Qun Hao ◽  
Chao Zhang ◽  
Jian She Ma
Keyword(s):  
Detailed Analysis ◽  
Distortion Correction ◽  
Experimental Results ◽  
Qr Code ◽  
Quick Response ◽  
Response Code ◽  
Cylindrical Object ◽  
Quick Response Code ◽  
Curl Distortion ◽  
Unified Method

Distortion typically occurs when images are captured from the surface of a cylindrical object. This problem is obvious in Quick Response (QR) code images, which necessitate distortion correction for subsequent information reading. Based on a detailed analysis of this distortion, we divided it into linear distortion along the generatrix direction and curl distortion perpendicular to the generatrix direction, and proposed a unified method to correct the distortion of both components. Experimental results are given to demonstrate the feasibility and applicability of the method.

scholarly journals Parameters to reduce waste in the paper curl process in a PIM company

2020 ◽  
Vol 8 (3) ◽  
pp. 185-198
Author(s):  
Felipe Do Nascimento Vaz ◽  
Dalzira De Sousa Pereira ◽  
Jonas Gomes da Silva
Keyword(s):  
Production Process ◽  
Management System ◽  
Production Management ◽  
Competitive Environment ◽  
Production Management System ◽  
Corrugated Cardboard ◽  
A Company ◽  
Paper Curl

In a highly competitive environment among companies, standardization of processes has been one of the means to reduce errors, defects, and costs. Thus, the objective of this study is to investigate what is the best standard with parameters to be applied to the manufacture of corrugated cardboard in a company in the Industrial Pole of Manaus (PIM), aiming to reduce the number of wastes from this process. The data were collected from the production management system of company X and analyzed through brainstorming with the employees of the studied process. At the end of the research it was concluded that the parameters that most influence the generation of approximately 9 types of scrap are: (a) Temperature of the cover and core; b) Press pressure; c) Corrugate pressure; d) Glue crack; e) Pressure of the coil door brakes. To reduce factory waste, a standardized list was proposed containing the parameters for each composition, observing the peculiarities of this production process.

Curing Temperature Study for Curl Distortion Control and Simulation in Projection Based Stereolithography

2014 ◽  
Author(s):  
Kai Xu ◽  
Yong Chen
Keyword(s):  
High Resolution ◽  
Curing Temperature ◽  
Test Case ◽  
Ir Camera ◽  
Temperature Study ◽  
Distortion Control ◽  
Curl Distortion ◽  
Major Factors ◽  
Thermal Cooling ◽  
Case Based

Polymerization shrinkage and thermal cooling effect have been identified as two major factors leading to the curl distortion in the Stereolithography (SLA) process. In this paper, the curing temperatures of built layers in the mask image projection based Stereolithography (MIP-SL) process are investigated using a high-resolution infrared (IR) camera. The curing temperatures of built layers using different exposure strategies including varying exposure time, grayscale levels and mask image patterns have been studied. The curl distortions of a test case based on various exposure strategies have been measured and analyzed. It is shown that, by decreasing the curing temperature of built layers, the exposure strategies using grayscale levels and mask image patterns can effectively reduce the curl distortion. In addition to curl distortion control, the curing temperature study also provides a basis for the curl distortion simulation in the MIP-SL process.

Deformation Control Based on In-Situ Sensors for Mask Projection Based Stereolithography

2014 ◽  
Author(s):  
Kai Xu ◽  
Yong Chen
Keyword(s):  
Temperature Increase ◽  
Computer Aided Design ◽  
Test Case ◽  
Element Analysis ◽  
Ir Camera ◽  
Deformation Control ◽  
Fea Model ◽  
Building Process ◽  
Curl Distortion

Curl distortion is one of the main reasons for the part inaccuracy in the Mask Image Projection based Stereolithography (MIP-SL) process. During the building process, the photopolymerization of liquid resin leads to temperature increase. After cooling down, the cured layers will shrink while they are constrained by its supports or the previously built layers. Consequently, residue stresses exist in the built part and will lead to curl distortion after all the supports are removed. In this paper, we investigate the thermal effect in the building process by using an infrared (IR) camera as an in-situ temperature monitoring sensor. Test cases of cured layers with different shapes, sizes and layer thicknesses have been designed and tested. The experimental results show that the temperature increase of a cured layer is mainly related to its layer thickness, while its shapes and sizes have less effect. The temperature increase of a cured layer is also related to its building position in the Z axis. The calibrated temperature increases in the MIP-SL process can be incorporated in a Finite Element Analysis (FEA) model in order to simulate the curl distortion of a given computer-aided design model. Physical experiments of a simple test case have been built, measured, and compared with the FEA simulation result. A discussion of the curl distortion in the MIP-SL process including its prediction and compensation is given.

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