Manufacturing method of paper pouring gate pipe formed by combining half pipes

Abstract

A manufacturing method of a paper pouring gate pipe formed by combining half pipes comprises the following steps: step 1, pulping: crushing and dispersing pre-weighed raw materials, and pulping with circulating water to obtain mixed pulp; (2) forming: injecting the mixed slurry obtained in the step (1) into a forming machine to form a semi-pipe wet blank of at least two pipe fittings which are connected together at the flange; 3, wet blank drying, wherein the formed wet blank obtained in the step 2 is dried till the water content is 0-35%; 4, die cutting, heat setting and curing are conducted, and a semi-pipe finished product is obtained; (5) bonding: applying glue on the bonding surfaces of the two half pipe finished products, then putting the two half pipe finished products into two half dies of a pair of bonding dies respectively, and pressing after the bonding surfaces are accurately aligned; and 6, cutting is conducted, specifically, final cutting is conducted on the remaining connecting positions after die cutting. According to the paper pouring gate pipe prepared by the preparation method disclosed by the invention, the production cost can be greatly reduced while the performance of the paper pouring gate pipe is ensured, so that the paper pouring gate pipe is widely popularized.

Description

technical field [0001] The invention belongs to the field of sprue pipe preparation, in particular to a method for making a paper sprue pipe composed of half pipes. Background technique [0002] 1. The sprue tube is a common consumable for casting. There are paper sprue tubes, ceramic sprue tubes and foam sprue tubes on the market. The wet-formed paper sprue tube of CN100363127C patented by Kao Corporation of Japan is in China It already has a certain market share and many factories are in production, but they are all faced with the problem of high production costs due to two reasons of raw materials and craftsmanship, so they cannot compete with ceramic sprue tubes and foam sprues. As a result, casting consumables such as paper sprue tubes, which are easy to use, can effectively improve the quality of castings and reduce solid waste emissions, cannot be widely promoted. [0003] 2. The paper sprue tube made by the method of making half tube by wet method first and then com...

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Problems solved by technology

[0004] 1. Selection of raw materials: In order to meet the normal temperature strength and high temperature strength requirements of the sprue pipe in the existing technology, a certain proportion of expensive carbon fiber needs to be added in practice, thus increasing the cost of raw materials

[0005] 2. The ratio of novolac resin to curing agent urotropine: in the prior art, when using novolac resin as an adhesive, generally urotropine and novolac resin are mixed in a weight ratio of 1:9 , Practice has proved that the amount of urotropine in this ratio is too small for the half-pipe combined paper sprue tube manufacturing process. The time in the middle, so that the production efficiency is greatly reduced

[0006] 3. The division method between multiple pipe fittings in each mold: the existing technology is to divide the half pipe by sawing and woodworking engraving and milling machine engraving and milling after the half pipe is heat-set, solidified and bonded into a whole. Practice has proved that this The method is very inefficient and dusty

[0007] 4. The method of sizing the adhesive surface: the prior art tried to use a glue rolling machine to roll hot melt adhesive, but failed to solve the problem of how to evenly roll hot melt adhesive on the hard, non-smooth and discontinuous adhesive surface , so we have to use a glue dispenser, and the efficiency of the glue dispenser is much lower than that of the roller

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