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@plasticmouldinjectionmold
Four measures to reduce defects in injection molded products
Equipment:(1) Plasticizing capacity of injection molding machine is smallIf quality of product exceeds actual maximum injection quality of injection molding machine, supply will not make ends meet; if quality of product is close to actual injection quality of injection molding machine, plasticization is insufficient, heating time of material in barrel is insufficient, mold cannot be provided with…
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How to choose screw for different raw materials?
One. PC Features: ①Amorphous plastic, no obvious melting point, glass transition temperature 140～150℃ melting temperature 215℃～225℃, molding temperature 250℃～320℃. ②Viscosity is large, and it is more sensitive to temperature. It has good thermal stability in normal processing temperature range. It will not decompose after a long stay at 300℃. It will start to decompose when it exceeds 340℃.…
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Common problems and solutions for forming thread injection molds
1 Common problems of forming thread Molding thread with a thread-off structure in injection mold is a common injection mold structure, some problems often occur in production, which make mold unable to produce normally. Following takes unthreaded structure of injection mold of a car expansion kettle as an example to illustrate how to solve these problems. Common problems: ①Plastic part thread…
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Injection mold gate type and selection
Gate of plastic mold refers to a section of short runner connecting sub runner and cavity, which is entrance for resin to be injected into cavity. Shape, quantity, size and location of gates in the mold will have a great impact on quality of plastic parts. Therefore, selection of gate is one of key points in design of plastic mold. Gate will be introduced in several aspects below. One, main…
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Design essentials of injection mould for honeycomb drawer
Honeycomb drawer product is shown in Figure 1. Maximum size of product is 120.00 mm 88.50 mm 32.20 mm, average thickness of plastic part is 3.00 mm, material of plastic part is PC+ABS+PTFE, shrinkage rate is 1.0045, and weight of plastic part is 55.64 grams. Technical requirements for plastic parts are that there must be no defects such as peaks, underfilling of injection molding, flow lines,…
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How much do you know about thread common sense?
Thread type According to tooth type, it can be divided into triangular, trapezoidal, rectangular, serrated and circular arc threads;According to thread direction, it can be divided into left-hand and right-hand;According to number of spiral lines, it can be divided into single line and multi line;According to shape of thread body, it is divided into cylinder and cone. Two, elements of…
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Introduction to basic knowledge of color masterbatch (color species)
1. What is color masterbatch? Color masterbatch is also known as color type. Color masterbatch is a new type of special colorant for polymer materials, also known as pigment preparation.It is composed of three basic elements: pigments or dyes, carriers, and additives. It is an aggregate obtained by uniformly loading an ultra-constant amount of pigment or dye in resin, which can be called a…
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Design Essentials of Injection Mold for Shell of Intelligent Laser Signal Source
Product diagram of smart laser signal source housing is shown in Figure 1. Maximum size of product is 183.43 mm * 124.68 mm * 31.77 mm, average thickness of plastic part is 2.0 mm, plastic part material is PP, shrinkage rate is 1.015, and weight of plastic part is 56.49 grams. Technical requirements for plastic parts are that there must be no defects such as peaks, underfilling of injection…
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Causes and Solutions of Weld Line Defects in Plastic Parts
【Abstract】Weld line is an important factor affecting quality of plastic parts. Study found that: under same process conditions, strength of weld line area is only 10% to 92% of original material, which seriously affects normal use of plastic parts. This article introduces formation process of weld marks, influencing factors and solutions to eliminate weld marks. 1 Overview of weld lines Weld…
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What Should We Pay Attention To When Making Thin-Wall Molds?
The design and manufacture of thin-wall molds require attention to multiple aspects to ensure the performance of the mold and the quality of the product. Here are some key considerations: Mold design: The design of thin-walled molds should take into account the design of valves, side air, and oblique air to achieve fully automatic demoulding of the product. The mold design should ensure the…
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Design Essentials of Two-color Injection Mold
1. Classification Structure of two-color mold is closely related to two-color injection molding machine. There are seven categories of two-color machines, but two categories are commonly used. Correspondingly, there are two types of two-color injection molds, namely Asian two-color molds and European two-color molds. Two-color injection molding machines in Taiwan and Japan have two parallel…
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Plastic Injection Bowl Mould: Dishwasher kitchen plastic injection food ...
Design points of gating system-sub runner
Sub runner is material flow channel between main runner and gate. It is transition section where plastic melt flows from main runner into cavity and is responsible for smoothly changing flow direction of melt. In multi-cavity mold, it plays role of distributing melt to each cavity. Generally, no sub runners are set in single cavity molds 1 Design criteria 1) With the shortest distance and the…
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Design points of gating system-cold slug well, exhaust trough
1 Cold Well Design A cold slug well is generally provided at the end of main runner. Cold slug well is often equipped with a material pulling mechanism to pull out main runner condensate when mold is opened. Drawing rod form of cold slug well is shown in Figure 1. Figure 1a is a common form, which is also suitable for thermosetting plastics; Figure 1b is used for soft plastics, and is also…
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7 factors to be considered in injection molding process cannot be ignored!
1 Shrinkage Form and calculation of thermoplastic molding shrinkage are as mentioned above. Factors that affect thermoplastic molding shrinkage are as follows:1.1 Plastic Variety. During molding process of thermoplastic plastics, due to volume change caused by crystallization, strong internal stress, large residual stress frozen in plastic part, strong molecular orientation, etc., compared with…
Causes and solutions for problems in injection moulds
1. Difficulties in gate stripping During injection molding process, gate is stuck in sprue sleeve and is not easy to come out. When mold is opened, finished product shows crack damage. In addition, it is necessary for operator to knock out top of copper rod from nozzle so that it can be demolded after it is loosened, which severely affects production power. Main element of this shortcoming is…
Key points of design of injection mold of shielding cover
Product diagram of shield is shown in Figure 1. Maximum size of product is ø85.7 mm * 55.20 mm, average thickness of plastic part is 1.50 mm, material of plastic part is HIPS, shrinkage rate is 1.005, and weight of plastic part is 10.5 grams. Technical requirements of plastic parts are that there must be no defects such as peaks, underfilling of injection molding, flow lines, pores, warpage…
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