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Method for depositing printed and damp sheets and forming sheet stacks

A technology of stacking and sheeting, which is applied to printing and placing sheets on sheet stacks, in the field of graphics industry, and can solve problems such as irregularities

Inactive Publication Date: 2021-04-09
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 for depositing printed and damp sheets and forming sheet stacks
  • Method for depositing printed and damp sheets and forming sheet stacks

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 placing printed and moist sheets in a stacker of a printing press and for forming a stack of sheets, comprising: a) preparing on an auxiliary stack different from the stack of sheets An intermediate layer in the form of sheets, which can be used as a moisture barrier in a stack of sheets; b) placing a plurality of sheets on top of one another and forming part of a stack of sheets; c) making an intermediate layer Moving from the auxiliary stack onto the part of the stack of sheets; d) placing a plurality of sheets one above the other and onto an intermediate layer and forming another part of the stack of sheets, the intermediate layer being arranged on the stack of sheets between one part and another part. The invention advantageously makes it possible to reduce or even prevent deterioration of the sheets and / or sheet stacks caused by moisture and moisture exchange.

Description

technical field [0001] The invention relates to a method for depositing printed and moist sheets and forming a stack of sheets. [0002] The invention belongs to the technical field of the graphics industry, and here in particular to 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 formed sheet stack is composed alternat...

Claims

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Application Information

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Patent Type & Authority Patents(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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