IT1139705B - Thermoplastics injection moulded with high holding pressure - Google Patents
Thermoplastics injection moulded with high holding pressureInfo
- Publication number
- IT1139705B IT1139705B IT25033/81A IT2503381A IT1139705B IT 1139705 B IT1139705 B IT 1139705B IT 25033/81 A IT25033/81 A IT 25033/81A IT 2503381 A IT2503381 A IT 2503381A IT 1139705 B IT1139705 B IT 1139705B
- Authority
- IT
- Italy
- Prior art keywords
- pressure
- mould
- thermoplastics
- holding
- holding pressure
- Prior art date
Links
- 229920001169 thermoplastic Polymers 0.000 title abstract 3
- 239000004416 thermosoftening plastic Substances 0.000 title abstract 3
- 238000002347 injection Methods 0.000 title 1
- 239000007924 injection Substances 0.000 title 1
- 238000001816 cooling Methods 0.000 abstract 2
- 238000001746 injection moulding Methods 0.000 abstract 1
- 239000000155 melt Substances 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
An injection moulding method for thermoplastics, comprising the successive stages of filling, pressure-holding and cooling, is as follows. After the mutually communicating cavities of the mould have been filled and during the pressure-holding time and cooling time, the thermoplastics is kept at 40-50 deg.C above its melt temp. and is simultaneously forced at 900-3000 kp/cm2 pressure through the mould, until the entire quantity has been converted to the solid stage. The inner surfaces of the mould are then cooled down through -20 deg. to approx. the melt temp. While the pressure is raised, the cross-section of the outlet from the mould cavities is reduced and the temperature in these zones is increased. Pref., a pressure of 900-1400 kp/cm2 is used and the mould surfaces are cooled to between -20 and +60 deg.C. By holding the after-pressure in this way, the strength of the resultant product is increased by 2-5 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT25033/81A IT1139705B (en) | 1981-11-12 | 1981-11-12 | Thermoplastics injection moulded with high holding pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT25033/81A IT1139705B (en) | 1981-11-12 | 1981-11-12 | Thermoplastics injection moulded with high holding pressure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IT8125033A0 IT8125033A0 (en) | 1981-11-12 |
| IT1139705B true IT1139705B (en) | 1986-09-24 |
Family
ID=11215486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT25033/81A IT1139705B (en) | 1981-11-12 | 1981-11-12 | Thermoplastics injection moulded with high holding pressure |
Country Status (1)
| Country | Link |
|---|---|
| IT (1) | IT1139705B (en) |
-
1981
- 1981-11-12 IT IT25033/81A patent/IT1139705B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT8125033A0 (en) | 1981-11-12 |
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