Acrylic bottle basic knowledge of the whole

on account ofThe unique advantages of acrylic bottlesAcrylic packaging bottles in cosmetics packaging is very popular, if you are engaged in cosmetics-related industries, acrylic some simple common sense is a must need to have some understanding of the following about acrylic materials these points, learn well, take good notes:

First, understand the acrylic material

Acrylic, also known asPMMA or acrylic, from the English acrylic (acrylic plastic). The chemical name is polymethyl methacrylate, is an important plasticized polymer material developed earlier, with better transparency, chemical stability and weather resistance, easy to dye, easy to process, beautiful appearance, has a wide range of applications in the construction industry. Plexiglass products can usually be divided into cast sheets, extruded sheets and molded plastics.

Two,acrylic bottleApplications in the cosmetic industry

In the field of cosmetic bottle packaging, acrylic bottles are widely used in high-grade creams, lotions and other cosmetic packaging, popular in the market.Acrylic bottles not only have the characteristics of plastic: drop-resistant, lightweight, easy to color, easy to process, low cost, etc., but also has the characteristics of glass bottles have a beautiful appearance, high-grade texture. It allows cosmetic manufacturers to use the cost of plastic bottles to obtain the appearance of glass bottles, but also both drop-resistant, conducive to transportation and other advantages. AsiaKeli packaging bottles come in a wide variety of varieties and colors, and have extremely excellent overall performance, providing designers with a diverse range of choices, which can be dyed, and the surface can be painted, silk-screened, or vacuum-coated. At present, the domestic acrylic cosmetic bottle manufacturers are more concentrated in Shangyu, Zhejiang, where the manufacturers in China is also the first batch of manufacturers began to engage in the production of acrylic packaging, products are exported to Europe and the United States cosmetic bottle packaging market.

Acrylic packaging bottles have excellent transparency, light transmittance up to92% or above, good aging resistance, can be used outdoors with peace of mindTheAlthough acrylic bottles in the cosmetics market has been a great success, but in the food, medicine and other packaging areas did not get a wide range of applications, which is also worth acrylic bottle manufacturers to feel and explore a field.

Third, the processing technology of acrylic

1,casting molding

Casting molding is used to mold profiles such as Plexiglas sheets and rods, i.e., profiles are molded by the propriety polymerization method. After casting and molding, the products need to be post-treated, and the post-treatment conditions are as follows60℃Holding under 2h, 120℃Hold under for 2h.

2Injection molding

 Injection molding is done with granular materials produced by suspension polymerization, and the molding is done on ordinary plunger or screw type injection molding machines. Injection molded products also require post-treatment to eliminate internal stresses, which is performed in the70-80℃Hot air circulation drying oven, processing time depends on the thickness of the product, generally need about 4h.

3Extrusion molding

Poly(methyl methacrylate) can also be used for extrusion molding, suspension polymerization of granular materials produced by the preparation of plexiglass plates, rods, tubes, sheets, etc., but the profiles prepared in this way, in particular, plates, due to the small molecular weight of the polymer, the mechanical properties, heat resistance, solvent resistance are not as good as the profiles of the casting of the molding, and the advantages of the high production efficiency, especially for the tubes and other moulds when using the casting method. Difficult to manufacture profiles. Extrusion molding can be used single-stage or double-stage exhaust extruder, screw L/D ratio is generally in the20-25. Table 2 shows typical process conditions for extrusion molding.

4Thermoforming

 Thermoforming is a plexiglass plate or sheet made of various sizes and shapes of products in the process of cutting into the required size of the blanks clamped in the mold frame, heating to soften, and then pressurized to make it close to the mold surface, get the same shape with the surface, after cooling and shaping trimming the edges of the product. Pressurization can be done by vacuum drafting or by direct pressurization of the convex mold with the profile. Thermoforming temperature can refer to the table3 Recommended temperature range. The use of rapid vacuum low-draw molding products, it is appropriate to use close to the lower limit of the temperature, molding complex shape of the depth of the draw product is appropriate to use close to the upper limit of the temperature, and in general, the normal temperature.

5Engraving & Cutting

Mainly for the molded acrylic or colored acrylic materials for hollowing and engraving. Ordinary laser engraving and cutting machine can meet most of the acrylic products engraving and hollowing needs.

 IV. Process characteristics

 1Poly(methyl methacrylate) contains polar sidemethyl groups, which have obvious hygroscopicity, and the water absorption rate is generally in the range of0.3%-0.4%The drying conditions are80℃-85℃following drying4-5h The

 2Poly(methyl methacrylate) has obvious non-Newtonian fluid properties within the temperature range of molding process, melt viscosity will decrease significantly with increasing shear rate, and melt viscosity is also very sensitive to changes in temperature. Therefore, for the molding process of polymethyl methacrylate, improve the molding pressure and temperature can significantly reduce the melt viscosity, to achieve better fluidity.

3The temperature at which poly(methyl methacrylate) begins to flow is approximately160℃The temperature at which decomposition begins is higher than270℃It has a wide range of processing temperatures.

 4Poly(methyl methacrylate) melt viscosity is high, the cooling rate is fast, the products are prone to internal stress, so the molding of the process conditions control requirements are stringent, the products after molding also need to carry out post-treatment.

5Poly(methyl methacrylate) is an amorphous polymer with a small shrinkage rate and a small range of variation, typically around0.5%-0.8%It is good for molding plastic parts with high dimensional accuracy.

6Poly(methyl methacrylate) has excellent cutting properties and its profiles can be easily machined to various required sizes.