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Method of depositing wet printed sheets and forming sheet stack

A sheet-stacking and sheet-sheet technology, applied in the graphics industry, printing and placement of sheets on the sheet stack, can solve problems such as irregularities

Inactive Publication Date: 2020-01-03
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, incoming moisture may cause ripples (so-called "curling")
In addition, sheet stacks made up of sheets may have irregularities caused by moisture

Method used

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  • Method of depositing wet printed sheets and forming sheet stack
  • Method of depositing wet printed sheets and forming sheet stack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] figure 1A printing press 1 is shown, such as an ink printing press or an offset printing press. The printing press 1 comprises a stacker 2 comprising a chain conveyor 3 with grippers 4 for printed sheets 5 . The reference numeral 5 a designates a conveyed sheet (in gripper lock), and the reference numeral 5 b designates a dropped sheet deposited on the sheet stack 6 (sheet in flight phase). The sheet stack 6 has a bottom side 6 a and a top side 6 b. The sheet stack 6 rests on a stack support 9 and is preferably height-adjustable. In the vicinity of the stack carrier 9 there is an auxiliary stack carrier 10 on which the auxiliary stack 8 formed from the intermediate layer 11 is arranged. The auxiliary stacking bracket 10 is also preferably height adjustable.

[0038] According to the method according to the invention, an intermediate layer 11 (at least one, preferably a plurality of intermediate layers) is introduced into the sheet stack 6 . In this way, a section 7...

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Abstract

The invention relates to a method for depositing wet printed sheets and forming a sheet stack in a delivery of a printing machine, the method comprising: a) providing sheet-shaped intermediate layerson an auxiliary stack that is different from the sheet stack, the intermediate layers being configured to be used as moisture barriers in a sheet stack; b) depositing a plurality of sheets on top of one another and forming a first section of the sheet stack; c) moving an intermediate layer from the auxiliary stack onto the first section of the sheet stack; and d) depositing a plurality of sheets on the intermediate layer and on top of one another to form a further section of the sheet stack, with the intermediate layer arranged between the first section and the further section of the sheet stack. The invention advantageously provides a way of reducing or even eliminating quality losses in sheets and / or sheet stacks caused by humidity and humidity exchange.

Description

technical field [0001] The invention relates to a method for depositing printed and moist sheets and forming a stack of sheets with the features of claim 1 . [0002] The invention lies in the technical field of the graphics industry, and in this case in particular in the field of printing and placing sheets (for example paper) on sheet stacks. Background technique [0003] As the sheets are printed, moisture may enter the sheets. This moisture can enter the sheet, for example, via applied printing colors, humectants, varnishes or inks. Through the entry of moisture, the sheet may stretch and shrink again as it dries. Furthermore, the ingress of moisture can also lead to waviness (so-called "curling"). Furthermore, sheet stacks made up of sheets may have irregularities caused by moisture. [0004] Document DE G 14257 discloses a printing method in which the printing sheet and the intermediate sheet are each moved and placed jointly as counterparts. In this way, the form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65H29/50B65H31/00
CPCB65H29/50B65H31/00B65H2701/1131B65H29/041B65H33/00B65H2301/42256B65H2301/4263B65H2301/42632B65H2601/251B65H2801/21B41F23/0443B41J11/0015B41J11/007B41J13/076
Inventor S·威廉R·霍夫曼S·勒尔J·加森施密特R·米勒
Owner HEIDELBERGER DRUCKMASCHINEN AG
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